I thought I'd ask you for help in an online debate with some sharp folks who don't believe we are warming the earth. What's the most convincing science you know of on this? --Bob W, Pepe'ekeo, Hawaii

While we do not know every aspect of this change, it would probably be judicious not to allow this grand climate experiment to continue unabated, but rather address it in ways that increase economic growth, protect global security, and decarbonize our economy -- all at the same time.