green ideas from old buildings

My 100-year-old house is creaky, drafty, and uninsulated, but it does have some benefits.  Not the least of which is the gigantic shade tree on the West side which drops its leaves as soon as the weather cools down.

More green features explicated here: Historic preservation: the ultimate green industry
http://www.commercenewstoday.com/archives/2240-Historic-preservation-the-ultimate-green-industry.html