Liberalism as a political ideology and a philosophical doctrine has championed individual autonomy, social and political equality, and democratic and inclusive political institutions. Consequently, liberalism is known for its commitment to tolerance and value pluralism. Yet liberalism has been critiqued for being insensitive to claims of culture. Indeed, an attitude of benign neglect toward diversity was once quite common among liberals, as was a general lack of interest in global concerns. Worse yet, according to some critics the liberal tradition—in spite of its purported liberating mission of autonomy and self-determination (quintessential democratic values)—has provided the rationale for imperialism rooted in the liberal assumptions about reason and historical progress. Though these ironies are a clear source of embarrassment for today's liberals, liberalism still displays an uneasy commitment to pluralism. Liberals today are more challenged than ever to look at the dynamics of diversity both at home and abroad.

In the middle of the 1980s the pastoralists of Essakane, Burkina Faso, were dying. Drought gripped the drylands of West Africa, crippling peoples' semi-nomadic livelihoods of millet farming and goat herding. When rain finally returned after three years, the earth had hardened like concrete and water skimmed across the floodplain, barely penetrating the surface. Without arable land the people faced famine—until they discovered gold. Instead of a disaster area, Essakane transformed into a commercial oasis: a mining town of 10,000 miners and traders where gold is processed and exchanged for food, cloth, spices, and animals.

If the future of human rights is dependent on the capacity of the state to fulfill them, then one must focus on how the private sector interfaces with public values—an interface that directly affects how billions of people survive both economically and with dignity. During the last few years reports about multinational corporations shielding phenomenal profits from meaningful taxation have troubled governments and individual taxpayers alike. But there has been little effort to associate such tax avoidance schemes with corporate abdication of responsibility for advancing critical societal goals. Instead, much of the ensuing debate has centered on how to tax corporate profits fairly and more efficiently. While the ideas being marketed in this area are enlightening, there has been less discussion about why corporate taxation is a worthy public goal or what corporations should do voluntarily. The linkage between corporate tax avoidance and “corporate social responsibility” (CSR) has not yet been clearly drawn, but the moment has arrived to bridge the gap. That task may necessitate changing, fundamentally, the ethical framework within which corporate officers, boards of directors, shareholders, tax advisers, and stakeholders in general operate.

If you were organizing dinner parties for the world, you would need to put out 219,000 more place settings every night than you had the night before. That is how fast the Earth's population is growing. But global agricultural production is currently failing to keep pace. A June 2012 report by the UN Food and Agriculture Organization (FAO) sees trouble looming ahead, warning that “land and water resources are now much more stressed than in the past and are becoming scarcer.”

“Stab, smite, slay!” These are not the words of Bashar al-Assad telling his forces how they should deal with the Syrian rebel movement, or indeed those of any other contemporary political leader, but rather the words of Martin Luther exhorting the German nobility to a harsh response to the peasants' rebellion of 1524–1525. His writings show that he sympathized with many of the peasants' grievances so long as these did not issue in rebellion, but when they turned to force of arms, he responded sternly. This was not a peculiarity of Luther. Consider the following from an English courtier, Thomas Churchyard, writing admiringly of the treatment of Irish rebels in 1579 by Sir Humphrey Gilbert, commander of the English army sent to put down the rebellion:

The bequest for the Church Peace Union—the predecessor of today's Carnegie Council for Ethics in International Affairs (and the publisher of this journal)—was given by Andrew Carnegie in February 1914. The Church Peace Union subsequently sponsored the first worldwide gathering of religious leaders, which was held in Constance, Germany, on August 2, 1914. Convened under the shadow of an impending war, not all delegates made it to the gathering. Six months previously, Carnegie had stipulated that the Church Peace Union devote its funds to the deserving poor “after the arbitration of international disputes is established and war abolished, as it certainly will be some day.” This could happen, he noted, “sooner than expected, probably by the Teutonic nations, Germany, Britain, and the United States first deciding to act in unison, the others joining later.” The outbreak of war was a catastrophic blow to such hopes, as the very nations expected to be at the core of this civilized project descended into an orgy of destruction the likes of which the world had never seen.

Hunger continues to be one of humanity's greatest challenges despite the existence of a more-than-adequate global food supply equal to 2,800 kilocalories for every person every day. In measuring progress, policy-makers and concerned citizens across the globe rely on information supplied by the Food and Agriculture Organization (FAO), an agency of the United Nations. In 2010 the FAO reported that in the wake of the 2007–2008 food-price spikes and global economic crisis, the number of people experiencing hunger worldwide since 2005–2007 had increased by 150 million, rising above 1 billion in 2009. However, in its State of Food Insecurity in the World 2012 (SOFI 12) the FAO presented new estimates, having revamped its methods and reinterpreted its hunger data back to 1990. The revised numbers for the period 1990–1992 to 2010–2012 reverse the trend to a steadily falling one. Based on the FAO's new calculations, extreme undernourishment peaked in 1990 at a record-breaking one billion, followed by a significant decline through 2006, when progress stalled but did not reverse (see chart below).

Peace is normally understood as the absence of war among nations. But that definition presupposes the overarching importance of nations as the key units of human association. There are, however, many other non-national entities, such as races, ethnic communities, religions, cultures, and civilizations. These entities, too, engage in conflict from time to time, as exemplified by the interracial violence and religious antagonisms in various parts of the world today and, of course, that which took place in the past. Yet why do we preserve the terms “war” and “peace” only for interstate relations? This is a very limited perspective, inasmuch as wars are a phenomenon whose appearance long preceded the formation of nations in the modern centuries; and besides, a presumed state of peace among countries can conceal serious hostilities between races or religions within and across national boundaries. Nazi Germany was technically at peace with all countries till 1939, and yet violent acts were committed there against groups of people domestically who were not considered racially acceptable. In today's world, there are no large-scale international wars, but domestic tensions and physical assaults occur daily within many countries. Terrorists wage war against states and their citizens alike, but they are not nations. To counter their threat, war preparedness in the traditional sense may be useful, perhaps, but it is much less effective than the coming together of individuals and groups to create a condition of interdependence and mutual trust. World peace must fundamentally be founded on a sense of shared humanity, regardless of which country people happen to live in. To consider war and peace purely in the context of international relations, therefore, is insufficient, even anachronistic. What we need is less an international than a transnational idea of peace.

We can begin with a story. In his account of the reign of Harun al-Rashid, al-Tabari spends considerable time on the matter of Yahya ibn Abdallah. Scion of the family of ‘Ali ibn Abi Talib, Yahya was the leader of a group active in Daylam, a region in present-day Iran. Al-Rashid and other Abbasid leaders laid claim to the territory, but at the time (the 790s) they did not have effective control over it. Ever-sensitive to the challenge presented by sentiment favoring the house of ‘Ali, al-Rashid and his advisers devised a scheme by which the ruler of Daylam received payment for persuading Yahya to turn himself in. He did so, but only on the condition that al-Rashid provide him with a written aman, or guarantee of security.

A global ethic for the twenty-first century will be different from that of the twentieth century. While themes of normative and political continuity will exist, humankind's main moral challenges have changed. Between the two centuries lie the end of the cold war, the terrorist attacks of September 11, 2001, the global financial crisis, and the double transformation of the structure of power in world politics and the norms of sovereignty and intervention. Nuclear weapons will remain high on the agenda of a global ethic, but they will not hold as dominant a place as they did in the past century. This essay, focused on the continuing moral challenge of nuclear weapons, recalls the intellectual and moral lessons of the last century and identifies three leading issues in nuclear ethics today: post–cold war challenges to nonproliferation and deterrence, the new challenges posed by the terrorist threat, and recent proposals for Going to Zero.

The increasingly widespread and energetic engagement with the idea of just war over the last fifty years of thinking on morality and armed conflict—especially in English-speaking countries—presents a striking contrast to the previous several centuries, going back to the early 1600s, in which thinkers addressing moral issues related to war did so without reference to the just war idea.

Over the next few years much will be made of the hundred-year anniversary of the breakdown of the European peace into a thirty-one-year civil war that did not fully cease until 1945. In 2012 the European Union was awarded the Nobel Peace Prize in recognition of the fact that there has been no war within its borders for the past sixty years, and today the Union stands as a model for regional peace. But the consequences of the “Great War” and the disastrously unsuccessful “peace” of 1918 are still with us. Like Andrew Carnegie, Alfred Nobel recognized that it is essential that political decision-makers and a wider public act with an awakened sense of the everyday significance of world events.

The contemporary West is biased in favor of rebellion. This is attributable in the first place to the dominance of liberal political philosophy, according to which it is the power of the state that always poses the greatest threat to human well-being. But it is also because of consequent anti-imperialism, according to which any nationalist rebellion against imperial power is assumed to be its own justification. Autonomy, whether of the individual or of the nation, is reckoned to be the value that trumps all others. I surmise that it is because in liberal consciousness the word “rebel” connotes a morally heroic stance—because it means the opposite of “tyrant”—that Western media in recent years have preferred to refer to Iraqi opponents of the Coalition Provisional Authority in Iraq and Taliban opponents of the ISAF in Afghanistan not as “rebels,” but as “insurgents.”

Nuclear weapons proliferation is at the top of the news these days. Most recent reports have focused on the nuclear efforts of Iran and North Korea, but they also typically warn that those two acute diplomatic headaches may merely be the harbingers of a much darker future. Indeed, foreign policy sages often claim that what worries them most is not the small arsenals that Tehran and Pyongyang could build for themselves, but rather the potential that their reckless behavior could catalyze a process of runaway nuclear proliferation, international disorder, and, ultimately, nuclear war.