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Global warming today is not as great as it was on two prior occasions.

In the early part of the second millenium, some 800-1000 years ago temperatures on the earth were higher than they are today.

There was a warming also in the late 19th-early 20th century that occured after the Little Ice Age.

And, believe it or not there were no SUVs during either of those periods.

The indicators:

1 - the retarded growth of tree rings during cold times, the 

2 - the advance and retreat of mountain and polar glaciers

3 - coral growth rings revealing the temperatures of the ocean

The real question - are we sure there were no SUVs back then? 

Baliunas, Sallie, and James Glassman. "Global Warming Results from Natural Causes." Contemporary Issues Companion: Global Warming. Ed. Shasta Gaughen. San Diego: Greenhaven Press, 2005. Opposing Viewpoints Resource Center. Thomson Gale. University of Phoenix - main account. 24 Jan. 2008