More heat is not just a projection, it is a fact. The Intergovernmental Panel on Climate Change reported in 2007, "Warming of the climate system is unequivocal," and that most of the warming since the middle of the 20th century likely is caused by manmade pollution. Without the effect of heat-trapping gases, natural factors would have led to the planet getting cooler in the last several decades.
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The American West has warmed 70 percent more than the globe as a whole, and more than the rest of the United States outside of Alaska. The greatest western warming has been in the Colorado River basin, where it affects the snow-fed river that is the most important water source of the interior West. |
