Good point, thanks.
> It also opens up huge amounts of clean energy resources.
Sustainability research is making it clear that we already have an abundance of clean energy resources here on Earth. If Mars does indeed flood the market with cheap clean energy and makes clean energy the overwhelmingly obvious choice, then I agree that will be a net win. But the problem doesn’t appear to be a resource scarcity issue here on Earth so I’m unconvinced that the solution is more resources.
Also, what clean energy resources are you referring to specifically? We essentially need something that can be substituted into our existing fossil fuel infrastructure. Mars provides something like that?