Cost Accounting

How much will it cost the world to avoid the most drastic effects of climate change? Not so very much, according to the IPCC's latest report. Shave up to three percent off global GDP per year to 2050 and there's a good chance we could stay safely out of the danger zone. As The Economist magazine stresses, mitigation is a bargain, but the real problem is not price. The real problem is politics.