"Perry is a proponent of the cosmic ray and clouds theory as opposed to the CO2 global warming theory to explain recent global warming trends.
The cosmic ray and clouds theory was first put forth in the late 1990's by Danish physicist Henrik Svensmark.
In a July 2007 issue of Discover magazine, Svensmark said the theory is simply that solar activity can alter the amount of clouds in the atmosphere, which affects the temperature of the Earth. More clouds mean a cooler Earth because more of the sun's heat is being reflected. Fewer clouds equal a warmer Earth."
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