When you eat a carrot, set fire to a piece of paper or put a match to a lump of coal, carbon atoms are being yanked, juggled and ripped out of each other's embrace. We've gotten very good at breaking carbon bonds: that's how we light our cities, drive our cars, power our tools.
Source: http://www.npr.org/blogs/krulwich/2011/04/21/134573484/chewing-on-carbon-the-celery-question?ft=1&f=1007
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