https://www.amazon.co.jp/Conspiracy-Theory-America-Discovering/dp/0292757697

Not sure I’d call it a ‘conspiracy theory’ since the Left has been claiming “Overpopulation” for at least the last 50 years? Why would they NOT act on this ‘crisis’, when they literally act on EVERY other ‘crisis’ they identify.
In fact, thinking that the Left does NOT want to reduce world population is no different than conservatives sending their kids to government schools, thinking that the people who work there will leave their HATRED of American values at the door, rather than carry them into the classroom.