Abstract | There are many uncertainties concerning climate change, but a rough international
consensus has emerged that a doubling of atmospheric carbon dioxide from its preindustrial
baseline is likely to lead to a 2.5 degree centigrade increase in the earth's
mean surface temperatureb y the middleo f the next century.S uch a warmingw ould have
diverse impacts on human activities and would likely be catastrophic for many plants
and nonhuman animals. The author's contention is that the problems engendered by the
possibility of climate change are not purely scientific but also concern how we ought to
live and how humans should relate to each other and to the rest of nature; and these are
problems of ethics and politics.
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