Scientific American: The climate change debate has been polarized into a simple dichotomy. Either global warming is "real, man-made and dangerous,' as Pres. Barack Obama thinks, or it's a "hoax,' as Oklahoma Sen. James Inhofe thinks. But there is a third possibility: that it is real, man-made and not dangerous, at least not for a long time.
This "lukewarm' option has been boosted by recent climate research, and if it is right, current policies may do more harm than good. For example, the Food and Agriculture Organization...