But none of these scenarios seem particularly pressing. 1) Population growth rates fall as living standards improve, the UN predicts a rise up to 9 billion humans followed by a drop to more or less back to 7bil. 2) It would be easier to work on reversing climate change than finding a planet that supports life.

The way i see it we 're still in 'space exploration' not colonization. Perhaps if we master biology, life and intelligence first, we 'll have our drones do that for us.