As Japan's troubles continue, CISAC's Thomas Isaacs discusses the future of the nuclear industry.

CISAC: My understanding is that Three Mile Island set back the industry because afterward there was no appetite for building new reactors.

Thomas Isaacs: It's not clear that it was Three Mile Island. It was certainly in that time frame. Others would say it was a combination of a reduction in the demand for electricity at that time and the emergence of alternative energy sources that were less expensive to get started. You saw less of an appetite not just because of the concern about Three Mile Island -- although that was probably a contributing factor -- but because it just no longer made sense to build new, huge, expensive power plants, particularly nuclear power plants.

CISAC:  Experts now say that what's going on in Japan is worse than Three Mile Island. If so, how might that affect the building of nuclear reactors in the future?

Isaacs: The effects are probably unknown and unknowable now. We'll need to have a much better idea of what actually transpires, and how it is handled by the Japanese. We'll also have to see what the consequences are and what the perceived consequences are, and the ability of the Japanese government and utilities to generate a sense of confidence, which is lacking right now. All of that will have an effect and it will be different for a variety of countries, but it's hard to speculate. My own assumption is that in countries where there is more of a national, organized effort to build nuclear, principally in places like China and India, you might not see as much effect as you might see in countries where nuclear has been much more of a controversial issue, and where the public has much more engagement in the decision-making process. In emerging countries that now have no or very few plants, you might see much more controversy. 

CISAC: What about regulation? Might there be more regulation, both here and in China, India, and elsewhere?

Isaacs: I think we don't know that yet either. You would hope that people would view this as a sobering event -- an opportunity to learn lessons for the future. As a result of Three Mile Island and then Chernobyl we have organizations like the World Association of Nuclear Operators, who come together from all over the world to share lessons learned. This will be an example of a place where you would hope they will take this very seriously -- I'm sure they will -- and they will ask very searching questions about whether our regulations or anybody's regulations are appropriate given what we've experienced. There's no question that the track record for U.S. reactors has been outstanding and getting better over the last 20 to 30 years. Should that lead to a sense of comfort? No. It should lead to a sense that we've always had an obligation to ask ourselves if we're doing everything that makes sense, and we can continue to learn from experience and improve.

CISAC: The issue of nuclear waste is important in this country and elsewhere. How might it fit into what we're seeing in Japan right now?

Isaacs: There is spent nuclear fuel, which is a waste form if it's not reprocessed. That's what would ultimately go into the repository, and that potentially is one of the problems that's causing the release of radioactivity at some of these plants. More broadly, you need to feel confident you know how to handle waste, both in the short term and in the very long term, because it is potentially hazardous for geologic time periods. Most people who work in that business believe that disposing of it in a geologic repository, in a stable geologic formation that has the right characteristics, is a very fine way to solve that problem, and pretty much every country that has decided to move toward nuclear waste disposal has chosen that approach. But from a societal point of view and a political point of view, it's a very tough problem. It's not just the science and technology problem.

As Japan's nuclear troubles continue, CISAC's Alan Hanson discusses the range of scenarios and how to prevent catastrophe.

CISAC: What is the range of events that could happen over the next several days and weeks?

Alan Hanson: The earthquake and resulting tsunami that hit northern Japan last Friday are unprecedented in modern times. These two nearly simultaneous natural disasters did significant damage to the Fukushima nuclear power stations operated by the Tokyo Electric Power Company (TEPCO). Despite this damage, including a total loss of off-site power and emergency backup power, TEPCO personnel have been making a heroic effort to bring the situation under control. To date off-site releases of radiation appear not to have had severe effects to the local population; because of prevailing westerly winds, the radiation releases have not been in the direction of major population centers.

It is impossible to predict the sequence of events that will unfold over the next few days and weeks. Under the best of circumstances, TEPCO will continue to take actions limiting further releases. To do so they must continue to cool the nuclear fuel in two separate regions of each reactor in the two stations; these regions are the reactor core itself and the used fuel storage pool. This means that enough water must be continually injected to keep the fuel covered. More dire circumstances could occur if the nuclear fuel is uncovered for a lengthy period of time. In the reactor core, this could lead to partial or total fuel melting, followed by failure of the primary steel containment due to excessive heat and pressure. Since some fuel has been uncovered for some time intervals, it is believed that partial melting may have already occurred and that the primary containment has been damaged in one or two of the reactors. If used fuel in the storage pools is uncovered, it could lead to fuel cladding failures from high temperatures releasing radioactive gases directly into the atmosphere. In a very unlikely scenario burning of the fuel cladding would release more gases and also particulate matter into the atmosphere. The reactor cores are of immediate concern because that is where the highest temperatures are located. The fuel pools become of greater concern over the intermediate term as water is boiled off or if some other event causes draining of a pool.

CISAC: What can be done to prevent the worst?

Hanson: Both worst-case scenarios described above can be prevented by keeping the nuclear fuel covered with water by any means available including the use of sea water, which has been initiated already. The weather will play an important role, too. As long as winds blow radioactive gases off shore and away from population centers, the public health effects should be minimal; if winds shift and blow toward Japanese cities, the situation would be significantly worse.

CISAC: How can we prevent this sort of thing from happening again?

Hanson: It is too early to speculate about the possibility of future accidents such as this one. Suffice it to say that the combination of a magnitude 9.0 earthquake and a 30-plus foot tsunami is a highly unlikely event. If early reports from the site turn out to be true, the reactors rode out the earthquake reasonably well and all of them shut down in the orderly fashion planned for an earthquake. Without the subsequent tsunami, it is very doubtful that the ongoing crisis at Fukushima would be anywhere near the magnitude we are witnessing. The nuclear industry has a good record of learning from accidents and making the appropriate changes to prevent reoccurrence or to at least mitigate the consequences should something similar happen in the future. Actions will certainly be taken by the industry and regulatory bodies in this vein once the immediate emergency is behind us.

Each president of the United States enters office thinking he will be able to define the agenda and set the course of America's relations with the rest of the world. And, almost invariably, each confronts crises that are thrust upon him-wars, revolutions, genocides, and deadly confrontations. Neither Woodrow Wilson nor FDR imagined having to plunge America into world war. Truman had to act quickly, and with little preparation, to confront the menace of Soviet expansion at war's end. JFK, for all his readiness to "bear any burden" in the struggle for freedom, did not expect his struggle to contain Soviet imperial ambitions would come so close to the brink of nuclear annihilation. Nixon was tested by a surprise war in the Middle East. Carter's presidency was consumed by the Shah's unraveling and the Iranian revolution. George H.W. Bush rose to the challenge of communism's collapse and Saddam Hussein's invasion of Kuwait. Clinton squandered the opportunity to stop a genocide in Rwanda and waited tragically too long before stopping one in Bosnia. George W. Bush mobilized the country to strike back after September 11, but, in the view of many, he put most of his chips in the wrong war.

In the eye of the historical storm, and in the absence of a challenge as immediate and overpowering as September 11, Pearl Harbor, or the Nazis' march across Europe, it is risky to identify any set of world events as game-changing. Yet that is what many analysts, including myself, believe the Arab revolutions of 2011 are. And a surprising number of specialists-including hard-eyed realists like Fareed Zakaria-have seized upon the crisis in Libya as a defining moment not just for the United States in the region but for the foreign policy presidency of Barack Obama as well.

To date, one could say that Obama has had a surprisingly good run for a foreign policy neophyte. He has revived the momentum for arms control with a new START treaty with Russia, while pressing the issue of human rights within Russia. He has managed the meteoric rise of China decently, while improving relations with India. He has not cut and run from Iraq-as most Republicans were convinced he would. And he has ramped up but at least set limits to our involvement in Afghanistan. As the Arab revolutions have gathered momentum, he has increasingly positioned the United States on the side of democratic change. His statements and actions have not gone as far as democracy promotion advocates (like myself) would have preferred, but they have overridden cautionary warnings of the foreign policy establishment in the State Department, the Pentagon, think tanks, and so on. Without Obama's artful choreography of public statements and private messages and pressures, Hosni Mubarak might still be in power today.

All of this, however, may appear in time only a prelude to the fateful choice that Obama will soon have to make-and, one fears, is already making by default in a tragically wrong way-in Libya. Why is Libya-with its six million people and its significant but still modest share of global oil exports-so important? Why must the fight against Muammar Qaddafi-a crazy and vicious dictator, but by now, in his capacity for global mischief, a largely defanged one-be our fight?

When presidents are tested by crisis, the world draws their measure, and the impressions formed can have big consequences down the road. After watching Jimmy Carter's weak and vacillating posture on Iran, the Soviets figured he'd sit on the sidelines if they invaded and swallowed Afghanistan. They misjudged, but Afghanistan and the world are still paying the price for that misperception. In the face of mixed messages and a long, cynical game of balance-of-power, Saddam too, misjudged that he could get away with swallowing up Kuwait in 1991. When the United States did not prepare for war as naked aggression swept across Asia and Europe, the Japanese thought a quick strike could disable and knock out the slumbering American giant across the Pacific. When Slobodan Milosevic and his Bosnian Serb allies launched their war of "ethnic cleansing," while "the West"-which is always to say, first and foremost, the United States-wrung its hands, many tens of thousands of innocent people were murdered and raped before President Bill Clinton finally found the resolve to mix air power and diplomacy to bring the genocidal violence to a halt.

If Muammar Qaddafi succeeds in crushing the Libyan revolt, as he is well on his way to doing, the U.S. foreign policy establishment will heave a sad sigh of regret and say, in essence, "That's the nasty business of world politics." In other words: nasty, but not our business. And so: not their blood on our hands. But, when we have encouraged them to stand up for their freedom, and when they have asked for our very limited help, it becomes our business. On February 23, President Obama said: "The United States ... strongly supports the universal rights of the Libyan people. That includes the rights of peaceful assembly, free speech, and the ability of the Libyan people to determine their own destiny. These are human rights. They are not negotiable. ... And they cannot be denied through violence or suppression." Yet denying them through murderous violence and merciless suppression-with a massacre of semi-genocidal proportions likely waiting as the end game in Benghazi-is exactly what Qaddafi is in the process of doing.

Barack Obama has bluntly declared that Qaddafi must go. The Libyan resistance, based in Benghazi, has appealed urgently for the imposition of a no-fly zone. Incredibly, the Arab League has endorsed the call, as has the Gulf Cooperation Council. France has recognized the rebel provisional government based in Benghazi as Libya's legitimate government-while Obama studies this all. Can anyone remember a time when France and the Arab League were ahead of the United States on a question of defending freedom fighters?

There is much more that can be done beyond imposing a no-fly zone. No one in their right mind is calling for putting American boots on the ground in Libya. But we can jam Qaddafi's communications. We can, and urgently should, get humanitarian supplies and communications equipment, including satellite modems for connection to the Internet, to the rebels in Benghazi, where they can be supplied by sea. And we should find a way to get them arms as well. Benghazi is not a minor desert town. It is Libya's second largest city, a major industrial and commercial hub, and a significant port. Through it, a revolt can be supplied. If Benghazi falls to Qaddafi, it will fall hard and bloodily, and the thud will be heard throughout the world.

Time may be running out. As the Los Angeles Times reported yesterday, "All that stands between Kadafi and rebel headquarters in Benghazi are disorganized volunteers and army defectors spread thinly along the coastal highway." They have passion and courage, but they lack weaponry, strategy, and training. Like so many rebel movements, they need time to pull these all together. Time is what a no-fly zone and an emergency supply line can buy them.

Libya's rebels are pleading for our help. "Where is America?" asked one of them, quoted in the L.A. Times, who was manning a checkpoint in Port Brega. "All they do is talk, talk, talk. They need to get rid of these planes killing Libyan people." The "they" he was referring to was the Americans, beginning with their leader-one would hope, still the leader of the "free world"-President Obama.

Many prudent reasons have been offered for doing nothing. It is not our fight. They might lose anyway. We don't know who these rebels really are. We have too many other commitments. And so on. The cautions sound reasonable, except that we have heard them all before. Think Mostar and Srebrenica. And we had a lot of commitments in World War II as well, when we could have and should have bombed the industrial infrastructure of the Holocaust. As for the possibility that the rebels might lose-a prospect that is a possibility if we aid them and a near certainty if we do not-which would be the greater ignominy: To have given Libya's rebels the support they asked for while they failed, or to have stood by and done absolutely nothing except talk while they were mowed down in the face of meek American protests that the Qaddafi's violence is "unacceptable"?

Oh yes. There is also the danger that China will veto a U.N. Security Council Resolution calling for a no-fly zone. Part of us should hope they do. Let the rising superpower-more cynical than the reigning one ever was-feel the first hot flash of hatred by Arabs feeling betrayed. Go ahead, make our day.

Presidents do not get elected to make easy decisions, and they certainly never become great doing so. They do not get credit just because they go along with what the diplomatic and military establishments tell them are the "wise and prudent" thing to do. This is not Hungary in 1956. There is no one standing behind Qaddafi-not the Soviet Union then, not the Arab League now, not even the entirety of his own army. That is why he must recruit mercenaries to save him. Qaddafi is the kind of neighborhood bully that Slobodan Milosevic was. And he must be met by the same kind of principled power. For America to do less than that now-less than the minimum that the Libyan rebels and the Arab neighbors are requesting-would be to shrink into global vacillation and ultimately irrelevance. If Barack Obama cannot face down a modest thug who is hated by most of his own people and by every neighboring government, who can he confront anywhere?

For the United States-and for Barack Obama-there is much more at stake in Libya than the fate of one more Arab state, or even the entire region. And the clock is ticking.

On February 25 and 26, the Center on Democracy, Development, and the Rule of Law at Stanford University, in partnership with the Canadian Department of Foreign Affairs and International Trade, hosted a symposium titled, "Addressing the Accountability Gap in Statebuilding: The Case of Afghanistan." This event brought together leading experts, government officials, diplomats, practitioners, and academics to examine the problems of accountability, corruption, and election fraud that have risen in the wake of international statebuilding efforts in Afghanistan.

This unique forum allowed participants-both Afghan actors and members of the international community- who are heavily involved in building the institutions of the Afghan state, to participate in an honest exchange with their peers to surface challenges and generate recommendations to improve the practice of statebuilding moving forward. 

Panels were designed around the following questions: how to establish accountability in statebuilding, address electoral fraud evidenced in 2009 and 2010, manage powerbrokers who monopolize informal governance networks, coordinate anti-corruption efforts, and develop a political strategy for Afghanistan's future. What surfaced throughout these presentations and discussion was the issue of the "double compact" in Afghanistan-the failure of Afghans to self-govern and the failure of the international community to construct the institutions of a functioning state.

Participants proposed a new framework for governance that adopts a more participatory approach with the international community, Afghan government, and the public as equal partners in statebuilding endeavors. While challenges emerged there were also a number of key recommendations and strategies proposed  that can be pioneered by this influential group of policymakers and practitioners to ease the transition of responsibility to the Afghan government in 2014.  

The keynote address was delivered by former Afghan Minster of Finance and 2009 presidential candidate Dr. Ashraf Ghani, to an audience of more than 100 students and members of the local community. Dr. Ghani provided an honest and pragmatic account of the parallel and conflicting systems driven by the international community, which have given rise to systemic failure and corruption in Afghanistan.

"We are dealing with a crooked playing field," Dr. Ghani said recognizing that both the Afghan and international community were jointly responsible for this outcome. "When the field itself is crooked the nature of reform and change that we must initiate are very different. "

Dr. Ghani spent considerable time discussing the outsourcing of development to Washington-based firms that manage million dollar contracts and outsource technical work to foreign technocrats. This in Dr. Ghani's opinion does little to strengthen the internal capacities of the state, provide training opportunities to Afghans or allocate resources effectively to the general public.

Dr. Ghani stressed the importance of speaking honestly about these dysfunctions in the development system, "We need to start talking truth to each other if we are going to deal with this phenomenon. This double failure now is the genesis of the present."

Dr. Ghani channeled the sentiments of the Afghan public into the room by emphasizing the uncertainty that defines their lives. "Today it is the sense of injustice that drives conflict," Dr. Ghani said. "The level of conflict is driven by injustice. What Afghans yearn for is normalcy-the sense that the lives of our children and grandchildren will be better and what my generation endured will not be repeated."

The level of conflict is driven by injustice. What Afghans yearn for is normalcy-the sense that the lives of our children and grandchildren will be better and what my generation endured will  not be repeated.                    -Dr. Ashraf Ghani 

 Looking forward, Dr. Ghani advised that accountability mechanisms and feedback loops must be implemented to ensure that the necessary auditing and accounting mechanisms are in place to control corruption and ensure transparency. In addition, he called for one coherent system of rules that must be developed and agreed upon to govern development and prevent parallel systems from circumventing these rules. Finally, he advised adopting national programs that model the success of the National Solidarity Program, which reduced child mortality rates by 16%.

Dr. Ghani commented on the unique position that Afghanistan occupies at the crossroads of Asia, in the middle of "four huge hubs of change," China, India, Russia, and the Gulf. "A new regional era has to be created, if France and Germany could overcome hundreds of years of conflict we must create another sense of opportunity."

Dr. Ghani concluded by placing the hope and responsibility for Afghanistan's future in the hands of its younger generation, "We must talk about the generation compact in Afghanistan, our sons and daughters-both literal and figurative-are the source of growth and the source of dynamism...The women of Afghanistan, the youth of Afghanistan, and the poor of Afghanistan are the three numerical majorities that have been reduced to political and economic minority. Without investing in women, investing in youth and tackling the challenge of poverty, we are not going to have stability."

At the end of the two day symposium, participants collectively called for a comprehensive political strategy to facilitate the peaceful and legal transfer of power in 2014, which marks the end of President Karzai's term in office. With this important milestone in the near future, the international community remains committed to working with their Afghan counterparts to introduce political reform measures that will strengthen accountability mechanisms between the Afghan state and society. 

As Dr. Ghani eloquently stated at the end of his presentation, "We have to have an agenda of the future, we must engage in writing the history of the future."

Over the course of three short months, popular uprisings have toppled regimes in Tunisia and Egypt, sparked a civil war in Libya and created unrest in other parts of the Middle East. They also have raised a question in many people's minds: Are all authoritarian regimes now threatened by this new democratic wave? In particular, is China, a rising superpower, vulnerable to these forces?  

The Communist government in Beijing is clearly worried. It has limited news coverage of the recent uprisings and has clamped down on democratic activists and foreign reporters, acting pre-emptively against anonymous calls on the Internet for China to have its own "Jasmine Revolution." A recent front-page editorial in the Beijing Daily, an organ of the city's party committee, declared that most people in the Middle East were unhappy with the protests in their countries, which were a "self-delusional ruckus" orchestrated by a small minority. For his part, President Hu Jintao has urged the strengthening of what has been dubbed the "Great Firewall"-the sophisticated apparatus of censorship and surveillance that the regime uses to control access to the Internet.

No social scientist or intelligence analyst predicted the specific timing or spread of the Arab uprising-the fact that it would start in Tunisia, of all places, that it would be triggered by an event like the self-immolation of a vegetable seller, or that protests would force the mighty Egyptian army to abandon Hosni Mubarak. Over the past generation, Arab societies have appeared stolidly stable. Why they suddenly exploded in 2011 is something that can be understood only in retrospect, if at all.

But this doesn't mean that we can't think about social revolutions in a more structured way. Even unpredictable things take place in a certain context, and the present-day situations of China and the Middle East are radically different. Most of the evidence suggests that China is pretty safe from the democratic wave sweeping other parts of the world-at least for now.

Perhaps the most relevant thinker for understanding the Middle East today and China tomorrow is the late Samuel Huntington-not the Huntington of "The Clash of Civilizations," who argued that there were fundamental incompatibilities between Islam and democracy, but the Huntington whose classic book "Political Order in Changing Societies," first published in 1968, laid out his theory of the development "gap."

Observing the high levels of political instability plaguing countries in the developing world during the 1950s and '60s, Mr. Huntington noted that increasing levels of economic and social development often led to coups, revolutions and military takeovers. This could be explained, he argued, by a gap between the newly mobilized, educated and economically empowered people and their existing political system-that is, between their hopes for political participation and institutions that gave them little or no voice. Attacks against the existing political order, he noted, are seldom driven by the poorest of the poor in such a society; they tend to be led, instead, by rising middle classes who are frustrated by the lack of political and economic opportunity.

All of these observations would seem to apply to Tunisia and Egypt. Both countries have made substantial social progress in recent decades. The Human Development Indices compiled by the United Nations (a composite measure of health, education and income) increased by 28% for Egypt and 30% for Tunisia between 1990 and 2010. The number of people going to school has grown substantially; Tunisia especially has produced large numbers of college graduates. And indeed, the protests in Tunisia and Egypt were led in the first instance by educated, tech-savvy middle-class young people, who expressed to anyone who would listen their frustrations with societies in which they were not allowed to express their views, hold leaders accountable for corruption and incompetence, or get a job without political connections.

Mr. Huntington stressed the destabilizing power of new social groups seeking political participation. People used to be mobilized by newspapers and radio; today they are spurred to action by cell phones, Facebook and Twitter, which allow them to share their grievances about the existing system and to learn about the possibilities of the larger world. This change in the Middle East has been incredibly rapid, and it has trumped, for now, old verities about the supposed passivity of Arab culture and the resistance of Islam to modernization.

But do these remarkable developments tell us anything about the possibility for future instability in China?

It is certainly true that the dry tinder of social discontent is just as present in China as in the Middle East. The incident that triggered the Tunisian uprising was the self-immolation of Mohamed Bouazizi, who had his vegetable cart repeatedly confiscated by the authorities and who was slapped and insulted by the police when he went to complain. This issue dogs all regimes that have neither the rule of law nor public accountability: The authorities routinely fail to respect the dignity of ordinary citizens and run roughshod over their rights. There is no culture in which this sort of behavior is not strongly resented.

This is a huge problem throughout China. A recent report from Jiao Tong University found that there were 72 "major" incidents of social unrest in China in 2010, up 20% over the previous year. Most outside observers would argue that this understates the real number of cases by perhaps a couple of orders of magnitude. Such incidents are hard to count because they often occur in rural areas where reporting is strictly controlled by the Chinese authorities.

The most typical case of outraged dignity in contemporary China is a local government that works in collusion with a private developer to take away the land of peasants or poor workers to make way for a glittery new project, or a company that dumps pollutants into a town's water supply and gets away with it because the local party boss stands to profit personally. Though corruption in China does not reach the predatory levels of certain African or Middle Eastern countries, it is nonetheless pervasive. People see and resent the privileged lives of the nation's elite and their children. The movie "Avatar" was a big hit in China in part because so many ordinary Chinese identified with the indigenous people it portrayed whose land was being stolen by a giant, faceless corporation.

There is, moreover, a huge and growing problem of inequality in China. The gains from China's remarkable growth have gone disproportionately to the country's coastal regions, leaving many rural areas far behind. China's Gini index-a standard measure of income inequality across a society-has increased to almost Latin American levels over the past generation. By comparison, Egypt and Tunisia have a much more equal income distribution.

According to Mr. Huntington, however, revolutions are made not by the poor but by upwardly mobile middle-class people who find their aspirations stymied, and there are lots of them in China. Depending on how you define it, China's middle class may outnumber the whole population of the United States. Like the middle-class people of Tunisia and Egypt, those in China have no opportunities for political participation. But unlike their Middle Eastern counterparts, they have benefited from a dramatically improving economy and a government that has focused like a laser beam on creating employment for exactly this group.

To the extent that we can gauge Chinese public opinion through surveys like Asia Barometer, a very large majority of Chinese feel that their lives have gotten better economically in recent years. A majority of Chinese also believe that democracy is the best form of government, but in a curious twist, they think that China is already democratic and profess to be satisfied with this state of affairs. This translates into a relatively low degree of support for any short-term transition to genuine liberal democracy.

Indeed, there is some reason to believe that the middle class in China may fear multiparty democracy in the short run, because it would unleash huge demands for redistribution precisely from those who have been left behind. Prosperous Chinese see the recent populist polarization of politics in Thailand as a warning of what democracy may bring.

The fact is that authoritarianism in China is of a far higher quality than in the Middle East. Though not formally accountable to its people through elections, the Chinese government keeps careful track of popular discontents and often responds through appeasement rather than repression. Beijing is forthright, for example, in acknowledging the country's growing income disparities and for the past few years has sought to mitigate the problem by shifting new investments to the poor interior of the country. When flagrant cases of corruption or abuse appear, like melamine-tainted baby formula or the shoddy school construction revealed by the Sichuan earthquake, the government holds local officials brutally accountable-sometimes by executing them.

Another notable feature of Chinese government is self-enforced leadership turnover. Arab leaders like Tunisia's Zine al-Abidine Ben Ali, Egypt's Mr. Mubarak and Libya's Col. Moammar Gadhafi never knew when to quit, hanging on 23, 30 and 41 years, respectively. Since Mao, the Chinese leadership has rigidly adhered to terms of about a decade. Mr. Hu, the current president, is scheduled to step down in 2012, when he is likely to be replaced by Vice President Xi Jinping. Leadership turnover means that there is more policy innovation, in sharp contrast to countries like Tunisia and Egypt, which have been stuck for decades in the rut of crony capitalism.

The Chinese government is also more clever and ruthless in its approach to repression. Sensing a clear threat, the authorities never let Western social media spread in the first place. Facebook and Twitter are banned, and content on websites and on China-based social media is screened by an army of censors. It is possible, of course, for word of government misdeeds to get out in the time between its first posting by a micro-blogger and its removal by a censor, but this cat-and-mouse game makes it hard for a unified social space to emerge.

A final critical way in which China's situation differs from that of the Middle East lies in the nature of its military. The fate of authoritarian regimes facing popular protests ultimately depends on the cohesiveness and loyalty of its military, police and intelligence organizations. The Tunisian army failed to back Mr. Ben Ali early on; after some waffling, the Egyptian army decided it would not fire on protesters and pushed Mr. Mubarak out of power.

In China, the People's Liberation Army is a huge and increasingly autonomous organization with strong economic interests that give it a stake in the status quo. As in the Tiananmen uprising in 1989, it has plenty of loyal units around the country that it could bring into Beijing or Shanghai, and they would not hesitate to fire on demonstrators. The PLA also regards itself as the custodian of Chinese nationalism. It has developed an alternative narrative of 20th-century history that places itself at the center of events like the defeat of Japan in the Pacific war and the rise of a modern China. It is very unlikely that the PLA would switch sides and support a democratic uprising.

The bottom line is that China will not catch the Middle Eastern contagion anytime soon. But it could easily face problems down the road. China has not experienced a major recession or economic setback since it set out on its course of economic reform in 1978. If the country's current property bubble bursts and tens of millions of people are thrown out of work, the government's legitimacy, which rests on its management of the economy, would be seriously undermined.

Moreover, Mr. Huntington's scenario of rising but unfulfilled expectations among the middle class may still play out. Though there is a labor shortage among low-skill workers in China today, there is a glut of the college educated. Every year into the future, China will graduate more than seven million people from its universities, up from fewer than a million in 1998, and many of them are struggling to find work suitable to their self-perceived status. Several million unemployed college graduates are far more dangerous to a modernizing regime than hundreds of millions of poor peasants.

There is also what the Chinese themselves call the "bad emperor" problem. China's historical achievement over the centuries has been the creation of high-quality centralized bureaucratic government. When authoritarian rulers are competent and reasonably responsible, things can go very well. Indeed, such decision-making is often more efficient than in a democracy. But there is no guarantee that the system will always produce good rulers, and in the absence of the rule of law and electoral checks on executive power, there is no way to get rid of a bad emperor. The last bad emperor, commonly (if quietly) acknowledged as such, was Mao. We can't know what future tyrant, or corrupt kleptocrat, may be waiting in the wings in China's future.

The truth is that, much as we might theorize about the causes of social revolution, human societies are far too complex, and change too rapidly, for any simple theory to provide a reliable guide. Any number of observers dismissed the power of the "Arab street" to bring about political change, based on their deep knowledge of the Middle East, and they were right every year-up until 2011.

The hardest thing for any political observer to predict is the moral element. All social revolutions are driven by intense anger over injured dignity, an anger that is sometimes crystallized by a single incident or image that mobilizes previously disorganized individuals and binds them into a community. We can quote statistics on education or job growth, or dig into our knowledge of a society's history and culture, and yet completely miss the way that social consciousness is swiftly evolving through a myriad of text messages, shared videos or simple conversations.

The central moral imponderable with regard to China is the middle class, which up to now has seemed content to trade political freedom for rising incomes and stability. But at some point this trade-off is likely to fail; the regime will find itself unable to deliver the goods, or the insult to the dignity of the Chinese people will become too great to tolerate. We shouldn't pretend that we can predict when this tipping point will occur, but its eventual arrival, as Samuel Huntington might have suggested, is bound up with the very logic of modernization itself.

One critical element of the laws of war is a concept known as "belligerent privilege," which stipulates that combatants may legally kill other combatants but may not target civilians. What, then, does a soldier do about the fact that in modern warfare it can be extraordinarily difficult to tell the difference?

Terrorists often choose to move undetected through the ranks of civilian populations. They hide in plain sight by wearing civilian clothes rather than uniforms or distinctive emblems. "They may be farmers by day and fighters by night," said David Luban, a Georgetown professor of law and philosophy, at an event that was part of the Ethics and War series. What's more, civilians may offer food and shelter to enemy soldiers - do they in the process become combatants? And what, finally, should the soldier do about civilians who are being used as a shield to protect combatants?

These are tricky questions. Luban said the phrasing of the Geneva Convention leaves open the possibility that soldiers may legally target civilians in a conflict zone. Article 48 says the military must discriminate between civilians and combatants at all times. Yet Article 51 notes that civilians shall only enjoy full protection in times of conflict "unless and for such times as they take a direct part in hostilities."

Efforts to clarify these issues have proved to be "highly dangerous," said Luban. In 2009, the Obama administration made a change in the Military Commissions Act to label anyone who materially supports hostilities against the U.S. as an "unprivileged enemy belligerent." As a result, civilians who tacitly support an enemy regime or terrorist organization may be lawfully targeted. Unfortunately, the amendment drew no distinction between those who did so voluntarily and those who did so involuntarily. It other words, a civilian actively helping a terrorist might be construed to be a combatant. But less clear, said Luban, is how the U.S. government would consider an Afghan woman who under duress shelters members of the Taliban.

The lack of consensus, he said, has led to widespread confusion within the military. One soldier told Luban that he didn't "think anyone has worked out what to do when civilians take on certain risks by assisting the enemy," or what to do when "soldiers and civilians are indistinguishable."

It is equally difficult to know how far the military is obligated to go to protect innocent civilians. It is often left to the discretion of an individual solider or unit to make that call, and often in a split second. Luban cited one well-known example in which one British soldier, Frank Richards, was ordered to throw bombs into cellars to target German soldiers during the First World War. When Richards chose to issue a warning cry to alert civilians in hiding, he lost a key advantage over his enemy.

The attitude toward civilians is very different today, Luban said. The unspoken sentiment among soldiers is that "we'll not lose another life for these people." But they are wrong to think this way. Luban cited recent studies that indicate it is in the best interests of soldiers to protect the innocent. Brigades that actively try to prevent civilian casualties tend to take the fewest casualties in their own ranks. "If you're careless in protecting civilians," he argued, "you're careless in everything."

The key, Luban said, is establishing clear boundaries. Wars are inevitable, and no matter how compelling the moral arguments, he argued, "the states that ratify treaties like the Geneva Convention will never accept rules that ruin their own military effectiveness." However, the issues surrounding civilians in war zones must be addressed to ensure that soldiers are not left with a dangerous incoherence. Ultimately, he said, "we need analytic clarity."

A team led by FSE fellow David Lobell has found a valuable, untapped resource in historical data from crop yield trials conducted across sub-Saharan Africa. Combined with weather records, they show that yield losses would occur across 65 percent of maize-growing areas from a temperature rise of a single degree Celsius, even with sufficient water. Data from yield tests in other regions of the world could help predict changes in crop yields from climate change.

A hidden trove of historical crop yield data from Africa shows that corn - long believed to tolerate hot temperatures - is a likely victim of global warming.

Stanford agricultural scientist David Lobell and researchers at the International Maize and Wheat Improvement Center (CIMMYT) report in the inaugural issue of Nature Climate Change next week that a clear negative effect of warming on maize - or corn - production was evident in experimental crop trial data conducted in Africa by the organization and its partners from 1999 to 2007.

Led by Lobell, the researchers combined data from 20,000 trials in sub-Saharan Africa with weather data recorded at stations scattered across the region. They found that a temperature rise of a single degree Celsius would cause yield losses for 65 percent of the present maize-growing region in Africa - provided the crops received the optimal amount of rainfall. Under drought conditions, the entire maize-growing region would suffer yield losses, with more than 75 percent of areas predicted to decline by at least 20 percent for 1 degree Celsius of warming.

"The pronounced effect of heat on maize was surprising because we assumed maize to be among the more heat-tolerant crops," said Marianne Banziger, co-author of the study and deputy director general for research at CIMMYT."

"Essentially, the longer a maize crop is exposed to temperatures above 30 C, or 86 F, the more the yield declines," she said. "The effect is even larger if drought and heat come together, which is expected to happen more frequently with climate change in Africa, Asia or Central America, and will pose an added challenge to meeting the increasing demand for staple crops on our planet."

Similar sources of information elsewhere in the developing world could improve crop forecasting for other vast regions where data has been lacking, according to Lobell, who is lead author of the paper describing the study.

"Projections of climate change impacts on food production have been hampered by not knowing exactly how crops fair when it gets hot," Lobell said. "This study helps to clear that issue up, at least for one important crop."

While the crop trials have been run for many years throughout Africa, to identify promising varieties for release to farmers, nobody had previously examined the weather at the trial sites and studied the effect of weather on the yields, said Lobell, who is an assistant professor of environmental earth system science and fellow at Stanford's Program on Food Security and the Environment.

"These trials were organized for completely different purposes than studying the effect of climate change on the crops," he said. "They had a much shorter term goal, which was to get the overall best-performing strains into the hands of farmers growing maize under a broad range of conditions."

The data recorded at the yield testing sites did not include weather information. Instead, the researchers used data gathered from weather stations all over sub-Saharan Africa. Although the stations were operated by different organizations, all data collection was organized by the World Meteorological Organization, so the methods used were consistent.

Lobell then took the available weather data and interpolated between recording stations to infer what the weather would have been like at the test sites. By merging the weather and crop data, the researchers could examine climate impacts.

"It was like sending two friends on a blind date - we weren't sure how it would go, but they really hit it off," Lobell said.

Previously, most research on climate change impacts on agriculture has had to rely on crop data from studies in the temperate regions of North America and Europe, which has been a problem.

"When you take a model that has been developed with data from one kind of environment, such as a temperate climate, and apply it to the rest of the world, there are lots of things that can go wrong" Lobell said, noting that much of the developing world lies in tropical or subtropical climates.

But he said many of the larger countries in the developing world, such as India, China and Brazil, which encompass a wide range of climates, are running yield testing programs that could be a source of comparable data. Private agribusiness companies are also increasingly doing crop testing in the tropics.

"We're hoping that with this clear demonstration of the value of this kind of data for assessing climate impacts on crops that others will either share or take a closer look themselves at their data for various crops," Lobell said.

"I think we may just be scratching the surface of what can be achieved by combining existing knowledge and data from the climate and agriculture communities. Hopefully this will help catalyze some more effort in this area."

Lobell is a Center Fellow at the Program on Food Security and the Environment, a joint program of Stanford's Woods Institute for the Environment and Freeman Spogli Institute for International Studies.

The work was funded by the Rockefeller Foundation