This is why Elon Musk is advocating having more children. Our existing population is in decline. Without children growing up as workers to pay into the system. Illegals aren't educated enough to take good paying jobs, and thus become another burden on society.
Liberals think by reducing the population there will be more stuff for fewer people. They don't understand you can have a growing economy, develop substitutes for things in short supply, improve production, etc. Europe is already growing most of their vegetables in greenhouses, mostly in Holland. Even Norway and Sweden are growing vegetables in greenhouses due to their colder weather.