Hardly a day passes without journalists, policymakers, academics, or scientists calling attention to the worldwide scale of the environmental crisis confronting humankind. While climate change has generated the greatest alarm in recent years, other global problems-desertification, toxic pollution, species extinctions, drought, and deforestation, to name just a few-loom close behind. The scope of the most pressing environmental problems far exceeds the capacity of individual nation-states, much less smaller political entities. To compound these problems, economic globalization, the growth of...