Flat Earthers

It's essentially impossible to understand anything about the climate of Earth, Mars, and Venus without understanding the central role of CO2 as a climate regulator. Even though CO2 is only second to water vapor in its greenhouse effect, water vapor doesn't work as a climate regulator because it isn't stable. Any slight decrease in H2O decreases temperature which decreases water vapor and leads to a big freeze. If you can't understand this point, you essentially understand nothing - you are effectively as ignorant as you would be if you were convinced that the Earth was flat.

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