In reality though, most of the planet is inhospitable, except for a small portion of Africa where we evolved, and even that is no cakewalk.
As physicist David Deutsch says, you could drop most of us into the environment where we live, with no advances to keep us alive, like clothes, fire, houses and iPhones, and even most friendly climates like the Southeast US where I live would kill me during winter.
We rely on a lot of knowledge-based technology to keep us alive here on Earth. I don't know that it would be much different to keep us alive on Mars or some other planet. We would just grow used to those technologies as "normal."