I usually don't pay much attention to Bill Nye, but I'm in total agreement with this assessment of his:
Sorry, Elon Musk. Bill Nye says the idea of Mars colonization and terraforming – making a planet more Earth-like by modifying its atmosphere – is "science fiction."
"This whole idea of terraforming Mars, as respectful as I can be, are you guys high?" Nye said in an interview with USA TODAY. "We can't even take care of this planet where we live, and we're perfectly suited for it, let alone another planet."
As for living on Mars permanently: Sorry, Nye says that's not happening either. "People disagree with me on this, and the reason they disagree is because they're wrong," he quipped.
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If we ever DO colonize another planet, it will require technologies FAR beyond what we now have.