I tend to do a bunch of little things, recycle as much as possible, try to do as many errands in my Suburban (older model, NOT new) as I can, turn off lights and now I am unplugging things like the toaster, stereo, lights, etc. when not in use, and I have bought big reusable bags for groceries. They do pay when you use them but it is .02 per bag, the last grocery store gave .25 cents per bag. I am not doing it for the the money, but it seems kinda small to me.
What bags I do have, I use again, dirty diapers, small can liners, etc. so they are not being thrown away after one use. We have cold water that goes from the well to the refrigerator so I don't buy water bottles, the one I do have I have used countless times. And of course there are all the clothes that the girls outgrow, they are all donated to a charity so they get a second life. I am sure that there is more but I can't think of them right now.
I wish that grocery stores here would charge for each bag you use, they do in Europe so when my MIL (in Holland) goes grocery shopping, she grabs as many of her own bags as possible (and she walks!). Unfortunatly I think that would probably outrage people for a while and then they would understand.