Check and fix any water leaks. A leaky faucet can waste a lot of water.
Turn off lights, computers and other appliances when not in use.
If you have central air conditioning, do not close vents in unused rooms.
Use solar power for home and water heating
Plant trees to shade your home.
Shop at farmer's markets and buy food that was produced as close to your home as possible.
Eat more vegetables. This simple change is a way of opting out of the factory farming industry.
Don't use plastic bags - use cloth.
Use recycled paper
Don't use chemical pesticides.
Don't disturb wild places like forests, beaches, wetlands and other areas where animals make their homes. When you visit such areas, stay on trails so you don't accidentally cause damage to an animal's habitat.
Use the sun to heat your hot water
Install a low wattage motion censor night light for the bathroom.