It is impossible to exaggerate the environmental problem facing humanity in the twenty-first century. Nearly fifteen years ago one of us observed: "We have only four decades left in which to gain control over our major environmental problems if we are to avoid irreversible ecological decline."1 Today, with a quarter-century still remaining in this projected time line, it appears to have been too optimistic. Available evidence now strongly suggests that under a regime of business as usual we could be facing an irrevocable "tipping point" with respect to climate change within a mere decade.2 Other crises such as species extinction (percentages of bird, mammal, and fish species "vulnerable or in immediate danger of extinction" are "now measured in double digits");3 the rapid depletion of the oceans' bounty; desertification; deforestation; air pollution; water shortages/pollution; soil degradation; the imminent peaking of world oil production (creating new geopolitical tensions); and a chronic world food crisis—all point to the fact that the planet as we know it and its ecosystems are stretched to the breaking point. The moment of truth for the earth and human civilization has arrived
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