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The rains on Mars were new.
Water vapor in the atmosphere was new.
Clouds were new.
Once humanity started lobbing comets at Mars, it took less than forty years before there was enough water in the system to see rain. The storms always blossomed within a good old-fashioned dust storm. For twenty years it wasn't even rain, just muddy hail. But as we got the CO2 level up and the temperature rose, from time to time, we started to see honest to god rain.

It was like a bad day in the Gobi Desert.