More climate change basics

The following is a collection and rearrangement of some of my comments on how we know about the radiative effects of greenhouse gases like carbon dioxide and how big they are, made on another blog. I'm posting these here as in working things out to my own satisfaction to try to respond to some rather egregiously wrong claims by the blogger there, I believe I clarified a few things in a way that's worth preserving.

The starting view here has to be the Kiehl-Trenberth diagram of Earth's energy flows, even though in some ways (which I'll get to below) it may be slightly misleading.

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