Going to Mars has no deadline, and barely any stakes. If it proves practically unachievable, it’s a failed dream, or maybe just an indefinitely delayed dream; no big deal. Earth is already inhabited by millions of species, and if it becomes even one percent less hospitable, that’s an existential crisis.
No, it's not. This is just the typical scaremongering and dramatisation I'm getting so tired of. Every populated region on Earth becomes much more than one percent less hospitable every winter and there is no crisis, especially not an existential one. We can cope very well with minor changes in weather and climate and we will. Stop obsessing about climate doom scenarios, it's silly.
No, winter is part of the baseline. Life has evolved to to survive during winter, and societies have been built to handle it. We do not have ecosystem collapses or widespread climate refugees every winter. Permanent and unprecedented changes cause completely different problems than a few months of winter.