Plant a tree.
Wrap your presents with old maps, cloth, or even newspaper. USe your imagination and reuse, reuse, reuse!
Don't rinse your dishes before washing them.
Don't pre-heat your oven. Unless you are baking bread of pastries, pre-heating the oven is unnecessary. Also, instead of opening the oven door, just look through the window.
Recycle your newspapers.
Wash your clothes in cold or warm setting.
Go to a car wash. If everyone in the U.S. went to a car wash once instead washing their own car, we could save nearly 8.7 million gallons of water. This is especially important, considering the terrible drought California is.
Pay your bills online and recieve electronic statements instead of paper. We will be saving 18.5 million trees a year.
Use rechargeable batteries. Each year, 15 billion batteries are produced and sold. Only a fraction of them are recycled.
Choose cardboard matches over wood matches or lighters.
Use 1 less paper napkin.
Recycle glass. It reduces air pollution by 20% and water pollution by 50%.
Use both sides of paper. You will use half the amount of paper, saving trees and lowering pollution.
Change your lightbulbs to compact fluorescent bulbs (the swirly ones).
Turn of your computer when you're not using it instead of putting it on sleep mode. You can save 40 watt-hours per day.
Don't water your lawn between the hours of 7 am and 7 pm.
There is only one Earth. If we ruin this place by hurting the ozone layer or wasting water, we won't have a place to live. Besides, taking small measures to conserve can't hurt us.