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On average, meat-eaters contribute
46 to 51 percent more food-related greenhouse gas emissions than fish eaters, 50 to 54 percent more than vegetarians and 99 to 102 percent more than vegans. http://thinkprogress.org/climate/2014/06/27/3454129/eating-meat-carbon-emissions/
"We can't solve the climate problem with just what we are doing with fossil fuels and energy," said Doug Boucher, director of climate research at the Union of Concerned Scientists, which is lobbying for changing the pyramid. "Food is a big part of it."
http://www.latimes.com/nation/la-na-climate-food-20150118-story.html
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