http://www.twosidesna.org/US/Our-carbon-footprint-How-do-paper-products-fit-in
http://www.twosidesna.org/US/Digital-media-has-environmental-impacts
http://www.twosidesna.org/US/Avoiding-use-of-paper-may-well-result-in-significant-loss-of-forest-land-in-North-America
http://www.twosidesna.org/US/How-much-greenhouse-gases-do-emails-emit
http://www.twosidesna.org/US/Paper-or-Digital-Bills-and-Statements-What-Do-US.-Consumers-Prefer#.WxZzGw2OtCM.mailto
