Escaping Earth for a new world simply isn't a realistic plan.
These are ambitious goals for the off-world future of humanity — but they're also misguided, according to York University anthropologist Kathryn Denning. Denning told Space.com that the idea of building a colony to which humanity could escape if the Earth becomes uninhabitable is not only an unrealistic idea, but a dangerous one as well.
Denning argues that focusing on our interplanetary escape ignores the very real issues here on Earth — and that new discoveries in space shouldn't always be framed in terms of whether they can sustain humanity. Specifically, she worries that the search to replace Earth with a "planet B" frames environmental demise as inevitable.
"For me, the question is balance," Denning told Space.com. "How can we be enthusiastic about the human capacity to explore while maintaining our focus on what needs to happen here on this planet?"
Besides, any off-world settlements would likely depend on Earth for support or resources for generations and generations, Denning argues.
"The reality is, what would be needed to create a sustainable human civilization in the solar system that could effectively be a backup for humanity? That, for every kind of foreseeable future for, say, the next hundred years, requires a functioning and sustainable civilization here," she told Space.com.
READ MORE: Building a Planet B for Humanity Isn't a Good Enough Reason to Explore Space [Space.com]
More on space colonies: Reality Check: It Would Take Thousands of Years to Colonize Mars