Space

Cool article and the concept is neat, but it focuses almost exclusively on temperature and then reserves a single paragraph for why terraforming to anything even approaching human habitability is still a ridiculous, far-off venture:

Still, “Increasing the temperature of the planet is just one of the things that we would need to do in order to live on Mars without any assistance,” says Juan Alday, a postdoctoral planetary science researcher at the Open University not involved with the work. For one, the amount of oxygen in Mars’s atmosphere is only 0.1%, compared with 21% on Earth. The pressure on Mars is also 150 times lower than on Earth, which would cause human blood to boil. And Mars has no ozone layer, which means there is no protection from the Sun’s harmful ultraviolet radiation. What’s more, even once warmed, martian soils may still be too salty or toxic to grow crops. In other words, McInnes says, upping the temperature “isn’t some kind of magic switch” that would make Mars habitable.