Global warming is indeed happening; that much of it has recently been man-made; and that there is a risk of potentially disastrous consequences. The time has come to accept that global warming is a credible enough threat to require a public-policy response.
But what, exactly? A global treaty: it would be foolish to deal with this most global of problems in any other way.
It sets a long-term framework that requires frequent updating and revision, rather like the post-war process of trade liberalization. That is sensible because climate change will be at least a 100-year problem, and so will require a treaty with institutions and mechanisms that endure.
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