Pie in the sky thinking. If humans were capable enough to do terraforming, we'd be terraforming the Earth itself, to fix the problems caused by human activity.

Pie in the sky thinking. If humans were capable enough to do terraforming, we'd be terraforming the Earth itself, to fix the problems caused by human activity. (For example, by reducing the amount of greenhouse gases in the atmosphere, or by getting rid of all our garbage in the oceans.) And that's with all the resources of Earth freely available for the job. To expect us to terraform somewhere like Mars, and not have Earth's resources at hand, what could we use to do the job?