By Guest PostEnvironment, Scienceadam wolf, agriculture, agu, alaska, american geophysical union, Anthropocene, asia, beringia, betula, birch trees, california, carnegie institution, carnegie institution for science, chris doughty, chris field, climate, ecology, elephants, emissions, geological age, geophysical research letters, global warming, grassland, greenhouse gas, impact on climate, mammoths, NASA, North America, prehistoric farmers, russia, science in Stanford, Siberia, yukon territory
WASHINGTON — Even before the dawn of agriculture, people may have caused the planet to warm up, a new study suggests.
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