GregortT says: We should keep in mind that the Earth's warmth is almost completely dependent upon the Sun ... [That] doesn't imply that humans should throw up our hands and say that there's nothing we can do.

Quite right. My point of view exactly.

Thorne says: Sure, reducing our "carbon footprint" can reduce greenhouse gases somewhat. How much good it will do is questionable. One thing is practically certain. Any changes we make will be far less effective, and far more expensive, than politicians and conservationists want you to believe.

Sounds defeatist to me. We all know that politicians and activitists tell lies, but that shouldn't divert us from what we believe to be a sensible course of action.

TYWD