Many of us use very large capacity water tanks to flush our toilets. One way to quickly and easily save water is to put one or two bricks inside the tank. Saving a half-gallon of water EVERY time you flush will save money in energy used to treat and clean the water, and it will keep the associated CO2 emissions from polluting our atmosphere.
Go easy on the paper kitchen towels. Look for brands that have half sheet option. They do the same job as well that a full sheet does.
You know those 50 napkins you usually get with fast food meals? Don't throw them away when you're done. Put them with the rest of your paper napkins and use them for causal meals (probably not when you have guests over). Save some trees, and save yourself some money.
Say no to plastic/paper bags at grocery stores. Buy a pair of big reusable tote bags at Costco for just $1.50. Whole food donates a nickel to your choice of charity every time you say no to plastic/paper bag.
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?
Public Bathrooms: Dry your hands using air dryers only - stop producing paper waste and energy consumption trucking the paper towels and the trash all over the country. Air dryers are produced, shipped, and installed once and can be run using green energy.
Avoid using your clothes dryer - Clothes drying racks come in many varieties and are cheap. It only takes a day to dry and if you do a good job hanging, you won't need an iron either.
I've found that lather from a plain old bar of soap works just as well for shaving as shaving cream. It doesn't smell like eucalyptus, but it lubricates the blade, which is the point. It's also much cheaper, and it's better for the environment because you're not throwing away a metal can every two weeks.
Do you put pudding or Jello packs in your kids' lunches? Prevent some waste by making your own snack-packs with reusable 1/2 cup containers (like Gladware) and any flavor of Jello or pudding they like. It only takes a few minutes to prepare the mix. Not to mention you'd save a bundle. Just remember to remind the kids to bring home the containers.
Use blackle.com to search Google and "save a fair bit of energy" as they put it. The darker screen apparently helps save energy. Who knew?!