We're out of room? When did that happen?
Since before they forced you to sort and recycle your garbage.
Like the frog in water brought to boil, people just don't see the creeping incursions into their freedom that population growth causes.
People accept it as a given, for example, that you need a license to hunt for food and that there should be a bag limit on game.
Or that good land should be so scarce that it costs money.
It's already starting that we have to pay for the air we breathe (by paying for pollution control).