Conservation (is how green living) begins at home
A friend of mine was looking at this site a few days ago and commented that while the back yard is torn up, it would be an ideal time to install "geothermal" -- a ground-source heat pump. I see where he's coming from: he's had his house for years and has probably already done all he can with insulation and so forth. But we're not there yet... we're still at the efficiency stage.