Terraforming Mars: Unfortunately the Easiest

This begins with addressing Mars’ toxicity in its soil. Perchlorate salts present a direct barrier to any biological activity. The first step is the deployment of genetically engineered perchlorate-reducing bacteria (PRB) to filter the Martian soil on Mars. Once soil toxicity is significantly reduced, physical interventions—such as concentrated laser or microwave systems—can be used to release CO₂ and H₂O from the polar caps and subsurface ice, thickening the atmosphere and raising surface temperatures via enhanced greenhouse warming (McKay et al., 1991).

With improved environmental conditions, the next phase involves seeding photosynthetic extremophiles, engineered cyanobacteria, algae, and select fungi, to begin oxygen production along with the PRB, fix atmospheric nitrogen, and promote initial stages of soil formation. Over time, as surface temperatures and pressures reach key ecological thresholds, higher plants, invertebrates, and eventually aquatic and vertebrate species can be introduced in a phased, adaptive sequence to build up a resilient, self-sustaining biosphere.

Throughout this process, major risks include the long-term retention of the new atmosphere, the continued management of regolith and atmospheric toxicity, and careful monitoring for unexpected ecological interactions. Addressing perchlorate first using PRB establishes a biochemical foundation necessary for every subsequent stage of planetary engineering and ecosystem succession.