The two ways in which humankind can self-destruct – civil war on a global scale, or destruction of the natural environment – are rapidly converging. Today, global warming manifests itself in not just a rise in ocean levels, the increasing frequency of extreme weather events, the emptying of rivers and seas of their fish stocks, or the desertification of entire regions on the planet. It can also be seen at work in violent conflicts in Egypt, Libya, Mali, Syria, and many other places exposed to food price rises, drought and declining water sources. The large-scale flight of refugees and migrants from damaged areas, which has already caused wars in Asia and Africa, is now creating political turmoil in the heart of Europe.