You can start out as simple as using reusable shopping bags instead of plastic or paper. While paper will degrade, it still takes trees to make those single use bags. Reusable bags can sit in your car until needed and all you need to do is clean them every now and then.
Recycling is a way for you to not only help the environment, but also save a little money. Many municipalities limit the number of trash bags you can put out during a week. Any more than that, and it requires a sticker, and they cost money. There isn't a limit on recycling, so you can save some serious trash bag space by separating your paper, plastic and glass.
In the home, little things like turning off the lights when you leave a room and unplugging computer, phone, tablet and other charges when not in use reduces electricity consumption. Less electricity means less pollution and less money coming out of your pocket.
Keep your heat turned down as low as you can comfortably stand it. It takes electricity and natural gas to heat your home and those are limited resources. Keep the house a little cooler and keep the world a little cleaner.