Before Global Warming, Humans Caused Global Cooling, Study Finds

Read the full story in the New York Times.

When they arrived in the Americas centuries ago, European colonists brought pestilence and death. Their arrival was so devastating, in fact, that it may have contributed to a period of global cooling, according to a new study.

The research, to be published in the March issue of the journal Quaternary Science Reviews, represents an ambitious attempt to show that, through a series of events, human activity was affecting the climate long before the industrial revolution and global warming…

But the research isn’t without critics.

Robert Rohde, the lead scientist for the independent climate research group Berkeley Earth, said that while the authors clearly took care to assemble the estimates, the study, and some media coverage of it, overstated the role colonization played in the Little Ice Age.

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