Warmist Bill McKibben suggests that if harmless CO2 makes up one additional ten-thousandth of the atmosphere, downpours might increase 85%

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Hitting close to (my) home: New England downpours up 85% in my lifetime http://thinkprogress.org/climate/2012/07/31/616441/when-it-rains-it-pours-new-study-finds-extreme-snowstorms-and-deluges-are-becoming-more-frequent-and-more-severe/ …