I think crashing world economy and starvation will do it just fine. I know people point out that Malthusian predictions have always failed so far - but the rea

I think crashing world economy and starvation will do it just fine. I know people point out that Malthusian predictions have always failed so far - but the reason we got to >7G humans is that an enormous amount of science and engineering went into making things better, a large part of which was spearheaded by the US because world peace and prosperity was in the interests of millionaires and billionaires. Now they've decided this isn't in their interest anymore, so I worry that the trend in scientific progress that got us here will be more like the tide - we're now flapping our fins on the beach and the water is receding.