We are different from the Nazis and the Soviets not because we have more self-control -- we don't. We are different largely because postwar improvements in agricultural technology have provided the West with reliable supplies of food, our massive consumption of which says much about our limited self-control. But what if food were to become scarcer and more expensive, as seems now to be the trend? What if unfavorable climate change were to outrun our technical capacities? Or what if melting glaciers leave societies such as China without fresh water? Pinker claims, unpersuasively, that global warming poses little threat to modern ways of life. But it hardly matters whether he is right: states are already taking action to minimize its consequences. China, for example, is buying up land in Africa and Ukraine in order to compensate for its own shortage of arable soil. The fresh water of Siberia must beckon. If scientists continue to issue credible warnings about the consequences of climate change, it would be surprising if leaders did not conjure up new reasons for preemptive violent action, positioning their states for a new age of want.-- from War No More, Timothy Snyder's review of Steven Pinker's Better Angels of Our Nature.