Population growth is the rhino in the playpen, the root cause of our approaching eco-disaster that that no one honestly talks about. On the left we get an onslaught of information about what we must and must not do to prevent climate change. Good Democrats get Al Gore’s advice, which somehow never mentions the corporations doing the damage. And all of America gets feel-good electric car ads -- buy your way out of the problem, or at least your guilt if you happen to have any. But nowhere do we get an honest discussion about population growth. If you care to, argue that climate change may or may not destroy us. But uncontrolled population growth is guaranteed to do the job. As an old Idaho rancher told me, “You can’t run a hundred head of cattle on half an acre.”