Predictions without deadlines are not useful because you can keep kicking the can down the road forever. That's exactly what Paul Ehrlich has done since all of his predictions didn't happen.
Ehrlich's timing was not great and his book is almost unreadable but the things predicted therein have come to pass. It really is more crowded in Yosemite than in downtown LA, and the air quality is worse. There really aren't any non-toxic fish left to catch.
