Even at the current level of population demand on resources is too great and will be massively too great if poverty is eradicated (as it should).
The long term solution for both the environment and people's quality of life (I don't think that not being able to travel, not being able to eat what one wants, having to live in a small flat in a dense city with mass transit only is a good life) is not only to have an objective to cut emission but to also have an objective to cut population.
Now, that is a very sensitive topic and so everyone prefers to ignore it.