Of course. But it's easy to say something is impossible to do when we don't even devote serious time and resources to doing it. Experimentally or globally with the real biosphere.
I'm not saying that it's impossible, only that we could not do it on earth, which means doing it on a much less hospitable planet is a just a pipe dream.
For now, yes. Although with the world and climate going the way it is i don't suppose it matters much what is made possible three or more decades from now.
