2008 - US Army Strategic Studies Institute
GLOBAL CLIMATE CHANGE: NATIONAL SECURITY IMPLICATIONS ...the idea that there is such a thing as climate change is as close to established scientific fact as one can get. At its last meeting in February 2007, the IPCC concluded that human activity has indeed increased global atmospheric concentrations of carbon dioxide, methane, and nitrous oxide. It further concluded that “warming of the climate system is unequivocal,” and “most of the observed increase in globally averaged temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations.”
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