No-one cares about the natural causes of global warming as we cannot do anything about them. What we can do is reduce the amount of global warming produced by humans. We are polluting the planet way too much by not doing the simple things like recycling. Walking to wrok can make such a difference aswell. You can make a pledge to help the environment now on
Live Earth Pledge Tree. Design a leaf as part of the grapidly growing global network where people have agreed to do certain things to help the environment.