Before you throw away or recycle old magazines, consider donating them to your local hospital. Most will be glad to take the reading materials (in addition to any books you don't want) for their patients and visitors.
Don't just buy organic. Buy local. Yes, organic foods are better for the environment in terms of their production, but if you are buying organic blueberries that are shipped in from Chile, are you really doing a lot of good?
Plan ahead. Condense your errands so that you aren't running all around town in a disorderly fashion, using more gas than necessary. And if you are at a large shopping center where you need to go to multiple stores, park in the middle so you don't have to move your car for each store you need to go to.
When accelerating while driving, do so slowly. Putting the pedal to the floor uses more gas and is more inefficient. Try and keep the RPMs under 3000 for the most efficient driving.
Turn off your car when you aren't moving. According to one source, "An idling engine produces 50 to 100 more emissions than a warm engine. Plus, cars get the worst gas mileage when idling cold or warm. Gas is being burned for no forward motion."
Wait until you can fill up your washing machine before running a load of wash. Then you are maximizing the use of water for washing. Also, dryers are more efficient when they are more full. Don't just throw a pair of socks in by themselves to dry.
If you have stuff that you need to get rid of but don't have time to donate or have a yard sale, don't just chuck it. Check out Freecycle.org which will direct you to local freecycling groups. It's a great way to reduce land fill and put your stuff to good use for someone else. It's also a good way to find free stuff.
If you want to buy organic foods, but can't afford the extra cost, choose the foods that are typically higher in pesticides to buy organic. These include: apples, bell peppers, celery, cherries, grapes, peaches, pears, potatoes, raspberries, spinach, and strawberries.
Recycling isn't just for bottles and cans anymore. Check with your local recycling company to see what you can include. In many places you can recycle broken down boxes, junk mail, magazines, and more. Think carefully about your trash, and recycle everything you can.
When not using appliances or electronics, unplug them. Keeping them plugged in, even when turned off, still consumes electricity. This is especially true with cell phone chargers.