Is Geo-Engineering a Viable Alternative to Our Current Climate Change Initiatives?

Geo-engineering -- the idea that mankind can intentionally alter the earth's atmosphere to undo some of the effects of manmade climate change -- recently emerged from the worlds of academic papers and science fiction stories into public discourse, thanks to the broaching of the subject in the recent book SuperFreakonomics.

The Commonwealth Club's Climate One program investigated this topic in a recent program, which included Ken Caldeira, the atmospheric scientist at the heart of the SuperFreakonomics climate controversy.