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One of the most brain-damaged failures of the greenhouse gas vatican, is their ongoing refusal to accept that the temperature on Venus is controlled by the atmospheric pressure rather than the composition of the atmosphere.
The lapse rate on Venus is similar to Earth, despite very different chemistry. If greenhouse gases controlled the lapse rate, the humidity (amount of greenhouse gas H2O) would have a large effect on the dry lapse rate of Earth. It doesn’t.
The bottom of the Grand Canyon is hot for the same reason that Venus is hot. The atmospheric pressure is high. Venus and Mars have the same atmospheric composition. Venus is hot, Mars is cold. It is the pressure, stupid.
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