The world's been getting steadily warmer for the past 10,000 years, more recently in the last 500. Check out James Burke's "Connections." It'll give you a great perspective.
Global Warming is just more of the usual hand-wringing from the usual suspects. Humans bad, Earth good. This old world got along just fine for billions of years, and will continue to do so, in spite of us. Why do we insist on being so self-centered that we think everything humans do reverberates through the whole Universe? We're just inconsequential specks compared whith what this world has endured.