This photo provided b Nerilie Abram shows layers of ice that have built up over Antarctica and Greenland provide a way of reconstructing Earth’s past temperature. Man-made global warming may have ... more 
This photo provided b Nerilie Abram shows layers of ice that have built up over Antarctica and Greenland provide a way of reconstructing Earth’s past temperature. Man-made global warming may have started a few decades earlier than scientists previously figured, a new study suggests. Instead of the late 1800s, a slight almost imperceptible warming can now be tracked to around the 1850 in North America, Europe and Asia, according to a new study based on coral, microscopic organisms, ice cores, cave samples, tree rings and computer simulations. But some outside scientists aren’t convinced. (Nerilie Abram via AP) less 
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Associated Press
Wed, Aug 24, 2016 1:36 PM EDT