He wants white people to stop having kids. He’s a communist pretending to be a scientist.
As I mentioned in another post, you'd think that if Nye was concerned about overpopulation, poverty and the environment, he'd be worried about people having more children than they or their countries can support in Sub-Saharan Africa, where this is an actual problem. Instead, he is worried about too many children in "developed" (i.e. western, white) countries, even though most developed countries are at zero or negative population growth, and despite the fact that developed countries tend to be better at controlling pollution and stewarding our wild areas than any Third World nation.
One can only conclude that his concern for "the environment" is just another front to achieve the Leftist goal of "minority-majority" multiculturalism.