Since I had an debate with someone else about the global warming, those advices just appeared my mind to post it. So here are some of mine
Saving water and its bills, bath with friends and pee outside, the plants love your pee
(note, do not pee outside on your yard too much because it could cause the smells)
Plant more plants and tree that can feed you on your yard, it save your money to shop for foods.
Try carpool more, if you have city bus route nearby your home, try to use that more and get used with it, you will find the advantage to save your gas that way.
If you don't like sleep in a room that are too dark, use the glows. It's a fun to stare before sleeping.
Try use the candle during the bath, you will find it enjoyment and save electric.
Use any of the air fresher that DON'T use the electric. Example, incense instead of a plug in air fresher.
Plant tall trees near your house to keep your house cool during the hot summers.
Try to use the hangers for the lanudry to dry instead of dryer. You still can use it even the cloudy days, even all year round depends on the degree and the rains, or snows.
Try to bath only when it's necessary. It's okay to be dirty for a day or two without someone seeing you.
There are more, but I guess that's enough of mine.