Argument: Mars can be terraformed, while Moon cannot
"First step in terraforming Mars." On to Mars: "When we compare our moon to Mars, we see that Mars is much easier to terraform then the Moon. The moon's 28 day day-night cycle is unsupportable for plants and isn't comfortable for humans either. Plant growth on a greenhouse on the moon wouldn't be possible either: solar radiation would destroy them and if the greenhouse was made to shield the solar radiation ( a very thick greenhouse ), the temperature differences would kill the plants: Much too hot during day-time, much too cold during the night."