Uncommon Commentary #400!: And Since it's Not Made of Cheese Like the Moon, There's Nothing to Eat

Attempting to colonize Mars is a deplorable idea.  The Red Planet is almost completely unsuitable for human habitation, and there's really no reason to try to make it more suitable by, as has been proposed, monkeying with the atmosphere for the sake of engineering an "intentional greenhouse effect", because our own planet is generally far from crowded; the problem here is not one of excessive population but of extremely uneven distribution of that population.  Before we risk repeating elsewhere in the cosmos the same mistakes that we've made on our own world, let's put better effort into correcting what's gone wrong on Earth.