Do you have any plans for Earth Day? Have you tried to make any larger changes in terms of your impact on the Earth recently? What ideas do you have for others?

What I've been doing:
--I drive a TON so I'm trying to be more on top of maintaining my car so I get the best gas mileage I can (I bought a more fuel-efficient car last year and).
--I try to buy as much local/organic as possible.
--I buy in bulk when I can.
--I recently got 4 nice, sturdy shopping bags that I bring grocery shopping with me.
--I'm more conscious of turning the lights off and turning the heat down when appropriate.