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.
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.
Instead of a car, use an electric bicycle for all distances under 20 miles. It's fun and cheap, good for the environment, and your health.
Planning to buy a new book, bike, or any other stuff? Try Craigslist, eBay, and Amazon for used books first. This reduces energy consumption for producing new goods.