Thus The Guardian today. “Highest number of displaced since second world war, with children comprising more than half, says UN refugee agency,” elaborates the newspaper. A good number to remember, this. With seven-billion people around the world, this is still a pittance, but the connection with the last world war is surely sobering. As many have worried over the years, climate change is bound to displace so many people that war would be unavoidable. But could it cause another world war all by itself? That is anyone’s guess, of course. The continents to watch are Africa, Asia, and South America. If conflagration starts at several continents at once, this would be a world war in anything but name. At any rate, the number of displaced people around the world is a number too watch. And serious troubles are likely to come when it reaches about a hundred-million. The rich countries add up to about a billion people, and this would be a tenth of their own populations. Feeding so many people, half of whom are children, would be nigh impossible anywhere around the world.