The best way to get started helping to bring down global warming is with a series of small steps, that when repeated by our population in general, will produce big results. An example: Replacing conventional bulbs with CFB's. The fact that bulbs burn out gives ample apportunity to replace it with a greener alternative.
When it's time to repaint your home check out the newer heat shielding paints that will help reduce the energy needed to heat/cool you home. I mean, you're going to paint anyway...right? The cost is minimal and won't affect the total cost of painting your house all that much.
Click here for more information about heat shielding energy efficient paint.