Dr. Roy Spencer is a scientist that analyses the data from an environmental space satellite that I helped design (along with hundreds of other engineers), AQUA, EOS
If you are interested in exploring the actual science behind 'Global Warming' rather than just rely on what the various news media outlets, blogs, radio talk shows, ill informed Congressmen and women, not to mention Presidents, actors and actresses etc... then this is the website for you.
An actual scientist who is dedicating his life to this science of earth's environment. He has a terrific book (Climate Confusion) which explains the workings of earth's climate which helped me understand what makes the world hot and cold, and how it's ever changing weather is hard to predict on a daily basis much less 20, 30 years down the road.
...oops forgot my umbrella again.
Check out the various post on the good Dr. Roy's blog. 'Global Warming 101' is a good place to start.