Uninhabitable environments have stopped humans so far. We do not inhabit any environment even close to Mars-level hostile for any duration, or at scale. Antarct

Uninhabitable environments have stopped humans so far. We do not inhabit any environment even close to Mars-level hostile for any duration, or at scale. Antarctica has gravity, atmosphere, water, protection from radiation, and a workable way to transport supplies. The ISS supports a handful of people for short rotations, and is within reach of resupply from Earth. We don’t have colonies under the ocean, where there’s gravity, radiation shielding, food, water, oxygen, transportation. We don’t have colonies on the moon or anywhere else that informs us we can sustain colonies on Mars. We don’t have the technology to “harvest” elements from space, or to tow asteroids around. Mars is lacking nitrogen, which plants need to grow, and in any case we aren’t close to “terraforming” Mars, we can’t do that on our own hospitable planet. The payload capacity of the SpaceX Starship, if that’s what you refer to, is 150 tons, not a million, and that’s to low earth orbit, where it requires multiple refuelings to plausibly get to Mars one-way. Rocket fuel is heavy. 150 tons is not sufficient for the large amounts of equipment we need on Earth for mining operations, nor will the equipment we use now for mining, agriculture, construction fit into any spaceship we have. The “logistics” of the Starship collapse under scrutiny. See the Common Sense Skeptic videos on YouTube for hours of thoughtful analysis. We don’t have the technology to move the required mass to Mars now. We don’t have the technology to extract raw elements from space, or asteroids, or the Martian surface. We don’t have the technology to give Mars a magnetosphere (it doesn’t have one), much less a breathable atmosphere. We don’t have the technology to keep humans alive and healthy in 0.4 Earth gravity. We can’t get birds to lay eggs in space, or plants to grow at scale, or any of that stuff that just gets waved away as if all of the sci-fi tech exists because we saw it in movies. The SpaceX Mars plans are artist’s renderings, not working technology. All of this may happen in the distant future, with better propulsion systems, factories in orbit to avoid the Earth gravity well problem getting lots of mass into space, asteroid mining, terraforming, etc. But today and for the foreseeable future Mars is inhospitable and not a viable destination for human colonies, not even a hard-scrabble existence.