![]() ![]() ![]() ![]() Why are they so sure?Įarth’s climate has changed naturally over the past 650,000 years, moving in and out of ice ages and warm periods. This week, Scott Pruitt, Environmental Protection Agency administrator, who had said that human activity was not the primary contributor to global warming, acknowledged that it plays a role-but stressed the need to figure out exactly how much of one.ĭespite the many climate “skeptics” in key positions of power today, 97 percent of working climate scientists agree that the warming of Earth’s climate over the last 100 years is mainly due to human activity that has increased the amount of greenhouse gases in the atmosphere. The hearing featured three scientists who are dubious about the conclusions of the majority of climate scientists, and climate scientist Michael Mann, best known for his “hockey stick graph” of temperatures over the last thousand years illustrating the impact of humans on global warming. Last week, the House Committee on Science, Space and Technology, chaired by climate contrarian Lamar Smith, R-Texas, held a hearing on climate science. Scientists studying glaciers in Glacier National Park. ![]()
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