"The cost of a carbon offsets varies depending on the country where they are purchased (because of low demand the cost in the U.S. tends to be about a third of the cost in Europe where the demand is much higher). The U.S. price is around $5 per metric ton. While WindCurrent donated the carbon offsets for the Yale graduation, the cost for offsetting more than 724,000 miles in travel would have been around $1,000. (The average person can offset their CO2 emissions for around $50 a year.)"
http://www.studiodaily.com/blog/?p=177
http://www.studiodaily.com
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