Scientific American: Climate change may have begun to hit humans where it hurts–in the stomach. Research has shown how changing temperatures have influenced wheat yields in Montana over the last 60 years. And now catastrophic fires sweeping Russia give a taste of what climate change may bring to that bread basket. Millions of hectares of this year’s wheat crop have been lost to the heat, drought and fires this summer in Russia–prompting U.S. wheat prices to double in a matter of days. Fears of a …