Comment by ModernMech

> Wouldn’t it be far cheaper for a Mars civilization to exploit the resources of the asteroids rather than bother earth?

Depends on the resource. If they want milk and chicken for example, it might be better to get that from Earth.

> It’d be enormously uncomfortable for Mars adapted people to spend any time on earth.

They could breed a race of human slaves to work on Earth.

> I guess if it’s possible for a 007 style mad scientist scenario

I’m thinking more along the lines of a Martian Hitler scenario.