the year 2100. Ironically, the very fact that the greenhouse effect is a global problem militates against cutbacks in fuel use simply to reduce C02: Individual nations would bear the costs of conservation while all would share in the benefits. And for many poorer nations, such as Bangladesh, there are a number of more press- ing needs than combating the greenhouse effect.
Mankind may be only decades away from being able to engineer a kind of global countercooling, chiefly means of releasing into...