I:

Recycle everything possible
(We have a compost heap in our backyard for our organic trash.)
Walk everywhere I can. But I live out in BFE, so I'm usually driven into town, and then I walk everywhere.
Plant trees and other plants
turn off and unplug everything I'm not using.
Open the windows on a breezy day (when it's hot) instead of running the AC.
Use a fireplace in the winter to minimize the heater usage.
I grow all of my own vegetables and herbs...

And thats all I can think of now.

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