"Are heat waves more common than they used to be?"
This the question addressed by James Hansen & his colleagues in a paper just published in the Proceedings of the National Academy of Sciences. Their conclusion is that they are:
http://www.economist.com/node/21560235?zid=313&ah=fe2aac0b11adef572d67aed9273b6e55
/ global warming climate change carbon dioxide CO2 greenhouse gas /
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