Saturday, August 30, 2014

Marcotts Climate Reconstruction For the past 11 000 Years

The Atlantic has a look at a new study of historical temperatures - Were Screwed: 11,000 Years Worth of Climate Data Prove It
Back in 1999 Penn State climate scientist Michael Mann released the climate change movements most potent symbol: The "hockey stick," a line graph of global temperature over the last 1,500 years that shows an unmistakable, massive uptick in the twentieth century when humans began to dump large amounts of greenhouse gases into the atmosphere. Its among the most compelling bits of proof out there that human beings are behind global warming, and as such has become a target on Manns back for climate denialists looking to draw a bead on scientists.

Now its gotten a makeover: A study published in Science reconstructs global temperatures further back than ever before -- a full 11,300 years. The new analysis finds that the only problem with Manns hockey stick was that its handle was about 9,000 years too short.

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