CF Bulbs everywhere possible.
Lower heating point for winter and higher cooling point for summer.
Lower setting on hot water heater in summer, slightly raise in winter.
Full laundry load and dry at night (when cooler)
Handwash all dishes. (I have not even used my dishwasher once)
Plan out trips to save gas.
Recycle what the city takes.
Most of what I do is because I am frugal, but if it helps the environment that is good too.
Also I refuse to water my lawn. Let mother nature take care of it.