Carbon was known about during prehistorical times, of course with less scientific realization about its nature. Carbon was known most familiarly in those times as charcoal and diamonds. Carbon was used to fuse iron into steel, and as the main element in graphite. The truth of all this is that carbon is everything and every where. So then, what are carbon offsets?
Source: http://www.wired.com/geekdad/2012/04/carbon-offsets-wayback/
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