It's New Year's Day and the paper is full of predictions. The question of the day is how 2017 will go and especially can the U.S. survive the Trump earthquake? But, being a scientist, I find myself always trying to think longer term -- what are the basic problems the world faces, the roots of the issues that fill the papers? Will my grandchildren likely grow up in a good and prosperous world as I dearly wish? Unfortunately, I am filled with foreboding and I don't think this is just an old man's gloom. More precisely, I think essentially all the problems we face can be traced to one basic cause: the explosive increase of the human population -- Malthus's famous contention in An Essay on the Principle of Population. World population has increased by a factor of 3.4 in my lifetime. Recycle, buy solar panels -- fine, but nothing any of us can do is going to control our vast and still growing numbers and all the problems this unprecedented multitude brings.