Wrong. Thor was a good guy. It was his brother who was the villain
Wrong Avengers.
Anyway, I've long believed that we need to go up as well as out. Unfortunately the Earth rarely a still place, and thus any buildings would have to be extensively tested against wind and tremors, however skyscrapers and vertical farms are going to be something that is desperately needed if our population continues to grow and does not level off in 'peak child'.
Of course, we also need to expand outwards and better our defences against extraterrestrial objects, and for the love of God, get something, anything on another planet so that if this one takes a massive hit the human race will survive in some form elsewhere and our knowledge and technological achievements will continue. Otherwise, one rock and we're back to the dark ages for a few centuries before we're able to slowly claw our way back up the ladder. From being able to touch the sky to crowding around a fire in a cave in one easy hunk of rock.