There is a grain of truth in bb.s assertion that global warming is a natural phenomenon. As for returning to a 'normal' temperature, there is no such thing, as temperature variation is cyclic and doesn't really ever settle for any length of time.

There is some evidence we are in an interglacial, and the geological record is full of evidence that the earth has been much warmer, without permanent ice caps many times before (during the Mesozioc for instance). Check here for a brief discussion on the effects of interglacials and temperature variations between the ice ages.

There is no doubt in my mind that anthropogenic activities have exacerbated the process, but in geological terms this will not be noticed by geologists 10,000 years from now, who will see rapid warming but nothing that they would not expect.

All that said, Bush's attitude to the Kyoto protocol and the US public's deep desire to use the earth's resources as fast as possible and sod everyone else is not going to make life easier for anyone, including themselves in the long run.