Ok, here’s one thing to do tomorrow, from the EPA:

Actions You Can Take at Home
1. Change 5 lights
Change a light, and you help change the world. Replace the conventional bulbs in your 5 most frequently used light fixtures with bulbs that have the ENERGY STAR and you will help the environment while saving money on energy bills. If every household in the U.S. took this one simple action we would prevent greenhouse gases equivalent to the emissions from nearly 10 million cars.http://epa.gov