Stupid humans
This is what happens when billions of people just do whatever the fuck they want in a disconcerted and disorganised fashion, mostly capitalists and industrialists. We potentially get a completely avoidable situation where we could end up completely hindering our ability to launch into orbit. The space race hasn’t actually happened yet, but I can assure you, once this planet is close to exhaustion we will need to find somewhere else, that little hot potato isn't going anywhere soon