The following article is written more from an environmental/conservation perspective but thought it was an interesting read for those that are interested. Not a pellet guy so forgive me if this has been discussed, but the exportation of pellets was news to me!
http://climate.audubon.org/article/why-us-forests-are-fueling-europe
http://climate.audubon.org/article/why-us-forests-are-fueling-europe