![]() ![]() ![]() (When we eat meat, we're still eating the same carbon, except that it passes through livestock on its way into our mouths and out into the atmosphere.) The only way to add to the carbon in the atmosphere is to take it from a sequestered source like fossil fuels-where it has been safe from the atmosphere for millions of years-and combust it. Human beings do exhale almost three billion tons of carbon dioxide annually, but the carbon we exhale is the same carbon that was “inhaled” from the atmosphere by the plants we consume. Does the collective exhalation of carbon dioxide from all those people contribute significantly to global warming? The Population Reference Bureau, a Washington, D.C.–based research institute, released a report Wednesday that projects the world population will reach seven billion at some point in 2011. ![]()
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