Climate flux matched Europe's social rise and fall

Ancient tree rings show links between climate change and major events in human history, like migrations, plagues and the rise and fall of empires, said a study this week in the journal Science.

Texas entrepreneur hopes to turn mesquite into power

Randy Hill lives amid the fossil fuels of America, a place where natural gas and crude oil made millionaires and the landscape is dotted with pump jacks. But Hill, who lives outside Abilene in West Texas, is spending much ...

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