By Lara Farrar
(CNN) -- Twenty milligrams; that's the average amount of carbon emissions generated from the time it took you to read the first two words of this article.
Now, depending on how quickly you read, around 80, perhaps even 100 milligrams of C02 have been released. And in the several minutes it will take you to get to the end of this story, the number of milligrams of greenhouse gas emitted could be several thousand, if not more
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