The world’s most famous climate scientist just outlined an alarming scenario for our planet’s future

[BlancheSplanchnik]

34. War is one big way we depopulate.

And when organisms overwhelm their resources, community violence increases as well--that's a well observed result seen among all species. The niche gets overrun, and individuals fight to survive.

There doesn't need to be a slippery slope. Overpopulation deniers always claim that's the reason not to address the situation.
There are compassionate, reasonable ways to address the situation--free birth control for males and females, education, accessibility, and spreading the truth, in the time honored fashion of public service announcements. For industrialized and developing nations.

Though the window for self motivated change may have closed by now. Probably.

The old ways will continue...resource wars, community violence over lack of space, privacy and opportunity....disease, disasters....
We COULD do it the kinder, WISER way--encourage non-breeding, create incentives....but too many people deny the problem, claim technology and economic redistribution can solve it.