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Maybe we needed more proof, but wasn't this thought sort of a given?
http://www.mercurynews.com/science/ci_18035659?nclick_check=1
http://www.nature.com/ngeo/journal/vaop/ncurrent/abs/ngeo1141.html?WT.mc_id=TWT_NatureGeosci
http://www.mercurynews.com/science/ci_18035659?nclick_check=1
http://www.nature.com/ngeo/journal/vaop/ncurrent/abs/ngeo1141.html?WT.mc_id=TWT_NatureGeosci
