When I started looking into the claims of dangerous warming due to carbon dioxide, I was completely baffled, buried in details of climate models, puzzled by energy balance diagrams, and so forth. Was there a "greenhouse" blanketing the Earth, slowly frazzling us to death? The truth could have been anything. If you've followed this path too, you'll know what I mean. But one thing, one single piece of the jigsaw, cut through all the fog and answered the question. I want to show you the thing that absolutely clinched the global warming question for me. I have postgraduate training in physics, which helped, but the basic point is understandable by anyone, and in this article I want to explain what seems to me the key, conclusive fact in everyday terms.
Let's say it's a cold night and Fred climbs into bed:
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