World population growth history

The number of people on earth didn't hit one billion until about 1804.

Adding the next billion took just 123 years.

Adding the next billion took 33 years.

Adding the next billion took just 13 years--as did adding the each of the next 3 billions.

I'm not part of the school that believes governments should enact draconian population-control measures, but connnecting dots like this is pretty thought-provoking.  Reason is that the big cities are cesspools of the worst of human behavior, and growth of those cities is almost certain to make that worse.

Doesn't bode well.