I don't accept:
1. Population projections
2. Climate change is already on us so time to adapt, not prevent.
I don't accept them because they are like declarations by colonists about "vanishing" indigenous groups 150 years ago; false, romanticized, self serving.
The easy way is a moratorium on childbirth, starting with developed nations and elites who consume the most and rapid replacement of the current global economic system with an austere equal localized system which would compensate austerity with rapid life quality improvements, cleaner air, visible recovery of wild places everywhere. As well of course as conservation, renewables etc. Easier than wars, economic collapse, disease, famines.