We don't have powerful enough source of energy, and we don't have strong-enough materials. It's not just a question of height, it's also a question of orbital s

We don't have powerful enough source of energy, and we don't have strong-enough materials. It's not just a question of height, it's also a question of orbital speed. I don't say it'll never be done, but we certainly don't have good enough technology at the moment, and probably won't have for hundreds of years. (If we can survive for that long) And who on Earth has the available cash and resources to build it, even it were feasible?