If I plant trees in my yard, will it offset global warming?

Planting a few trees in your yard certainly won't obliterate your entire carbon footprint. But, it could cut your energy costs. How much carbon dioxide does the average tree absorb?

It's common knowledge that trees are good for the environment. Through photosynthesis, they devour the greenhouse gas carbon dioxide and give us oxygen in return. Scientists refer to this natural process of… » Full Story on HowStuffWorks