re: Should we attempt to "terraform" / green the Sahara desert

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I assume the benefit of trying to do it on Mars rather than Earth is that there wouldn't be hundreds of organisms potentially impacted by changing the environment of such a large section of a continent. We won't care about disrupting the natural environment of another planet.

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The problem with Mars is that it is very in hospitable to life even if you could terrafarm it, it lacks several key components needed for a stable planet.

While the planet may have water in the poles, it lacks a magnetic field meaning solar storms would blast the planet with solar radiation.

The atmosphere is also too thin to keep any breathable air that would be generated on the planet.

The gravitational force is much less on Mars than earth.

I thought this was a reference to Project Hail Mary