4. Transition to using only LED lighting. It would be pretty wasteful to throw out all of your current incandescent light bulbs if they still work, but whenever you replace a bulb or install new lighting, resolve to use LED.
5. Make your own home cleaners. This can save you money and greatly improve the air quality in your home in addition to keep unwanted chemicals out of the water supply (notice a theme here? A lot of these changes have many additional benefits, not just for the environment!