Ok, it may be "trollish" to say that the American way of life is unhealthy and bad for the environment and to express disapproval when this country spread its bad habits around the world. It is true nonetheless.

(Or maybe you think it is OK to eat 1kg of meat/day, own 1 car/person, drive 2h/day, eat burgers and watch TV?)

So facing this issue, two solutions:

1- Human being should be able to consume more, and therefore there need to be less of them.

2- Human being do not need to consume that much to be happy and, therefore, their demographics is not that much of an issue.

I let you choose.