> If we look at sustainability from the perspective of "preserving human existence as long as possible", then the only long-term solution is expanding to other

> If we look at sustainability from the perspective of "preserving human existence as long as possible", then the only long-term solution is expanding to other planets/solar systems. That's not really true, there are other solutions. Bombing us back to stone age, or keeping everyone poor and occasionally decimating the population through resulting pandemics and wars, are both working solutions that align well with the ideology behind the article. Now if we want civilized solutions that actually improve life for everyone, becoming an interplanetary species is mandatory.