More information about wood and trees at wikipedia.com: http://en.wikipedia.org/wiki/Wood,

http://en.wikipedia.org/wiki/Tree


Information about urban ecosystem analysis: http://www.americanforests.org/resources/rea/


National register of big trees: http://www.americanforests.org/resources/bigtrees/


Climate change calculator—leading to a web page on which to buy trees as carbon offsets: http://www.americanforests.org/resources/ccc/