[Mr Rogers]

“And what causes the Earth to ‘retain’ heat or ‘lose’ it? “

Beats me. But is there a theoretical reason why NOTHING could cause the earth to retain more heat? And if there is, what does that have to do with the Second Law of Thermodynamics?

I am not a believer in global warming. I think the idea that we knew what the average earth temperature was in 1867 to within a couple of degrees is ridiculous. The idea that we know the average temperature of the earth with precision in 29,846 BC is even more ludicrous. But I do not see how the laws of thermodynamics affect the situation...

[UCANSEE2]

But is there a theoretical reason why NOTHING could cause the earth to retain more heat?

Some things could, can. Again, what are they? Water Vapor and.... well, that's about it.

And if there is, what does that have to do with the Second Law of Thermodynamics?

I only had one answer, and it sucked, so...