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There’s a pernicious argument being made against energy efficiency, and it goes like this. Last winter was one of the warmest on record, so people had to spend less to heat their homes and businesses. That, combined with a “drilling binge ” in shale gas and new production, made for record low natural gas in prices in April, at less than $2 per million British thermal units (MMBtu). This phenomenon has boosted the U.S. economy to the tune of more than$ 100 billion annually, by one estimate. With such low prices, the thinking goes, investments in alternative energy and energy efficiency don’t make sense.