think calculus for this one, growth continuing in the positive will mislead when that growth is losing steam. Watch the animation near x=1 https://en.wikipedia.

think calculus for this one, growth continuing in the positive will mislead when that growth is losing steam. Watch the animation near x=1 https://en.wikipedia.org/wiki/Second_derivative#Relation_to_the_graph https://en.wikipedia.org/wiki/Second_derivative#Relation_to_.... The slope must decrease and reach flatline before it goes negative. It's all a matter of rates not absolute figures. Like a ball thrown up in the air, it goes up, and eventually reaches its peak, then begins its descent. We're nearing the peak population wise which is what a lot of these articles are getting at.