Still, no American athletes endure the kind of climate extremes that pro football players do.
FORBES: The NFL's Coldest Games
"There are a lot of steps that can be taken to prepare people for climate extremes, " he said.
CNN: Extreme weather: Get ready to see more of it, scientists say
"It's the extremes of water which are going to provide the biggest threat to the developing world from climate change, " he said.
BBC: Man with dead camel in desert. Image: Jim Loring/Tearfund
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