Jerome,
I like your take in post #72, even though you stole my Mars Rover idea (from post #29)! Your last 3 lines, however, seem to imply the greenhouse effect, which is more associated with Venus (whose surface temperature is around 780 degrees Fahrenheit). The Martian environment, on the other hand, is more akin to Antarctica, which is considered a desert, and is, indeed, extremely arid.
Best,
Martin
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