Thanks to this Reuters article, I've read about another very simple step you can take to help fight global warming. It was pretty obvious when I read about it, but sometimes the obvious things are the things we take most for granted.
The suggestion was to put less water in your kettle. Any time you're trying to boil water for anything (like, say, making tea or boiling pasta), you use energy to boil that water. The amount of energy is directly proportional to the volume of water you are trying to heat. So, if you use less water, it takes less heat to make it boil.
Again, it seems pretty obvious, but it's something I hadn't thought of. I don't make pasta very often (I'm on a diet and trying to lose about 30 more pounds), but when I do, from now on, I'll use less water to do it.