Man-made global warming started with ancient hunters
30 June 2010
WASHINGTON—Even before the dawn of agriculture, people may have caused the planet to warm up, a new study suggests.
Mammoths used to roam modern-day Russia and North America, but are now extinct—and there's evidence that around 15,000 years ago, early hunters had a hand in wiping them out. A new study, accepted for publication in Geophysical Research Letters, a journal of the American Geophysical Union (AGU), argues that this die-off had the side effect of heating up the planet.
“A lot of people still think that people are unable to affect the climate even now, even when there are more than 6 billion people,” says the lead author of the study, Chris Doughty of the Carnegie Institution for Science in Stanford, California. The new results, however, “show that even when we had populations orders of magnitude smaller than we do now, we still had a big impact.”
In the new study, Doughty, Adam Wolf, and Chris Field—all at Carnegie Institution for Science—propose a scenario to explain how hunters could have triggered global warming.
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Post ID#17823 - replied 7/2/2010 10:02 AM
Nice exercise, but rubish. Their calculations apparently include assumptions that over estimate the effect.
Post ID#17826 - replied 7/2/2010 12:02 PM
Post ID#17846 - replied 7/8/2010 7:53 AM