The "carrying capacity" of earth is well, well above (constantly revised) estimates. What will need to change is the efficiency of how we as a species make use

The "carrying capacity" of earth is well, well above (constantly revised) estimates. What will need to change is the efficiency of how we as a species make use of the earth. We can feed many times the current world population easily. We can house many times the current world population easily. What we can't accomplish is doing those things the same way we do things now. Advances in agriculture, energy and housing are needed. Advances which are happening as we furiously type at each other. Either we all die horribly or we'll all be fine.