According to a recent analysis by Minqi Li, economics professor at the University of Utah, the world economy must contract at a historically rapid clip -- at an annual rate of about –1 to –3.4 percent between now and 2050 -- if atmospheric carbon dioxide is to be held below 445 parts per million (ppm). That is the level at which we could run into a nightmare scenario in which warming could start feeding on itself in positive-feedback loops and lead to who knows what. Much deeper cuts are needed to get down to 350 ppm, at which the planet will remain in a familiar and comfortable condition.
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