The champions of peace will always be vulnerable to the argument that since the enemy, too, is whetting his knife, talk of peace is unrealistic, even dangerous or treacherous. The quest for peace, like the struggle to arrest climate change, requires that we think of ourselves not just as states, tribes, or nations, but as the human inhabitants of a shared space. It demands feats of imagination as concerted and impressive as the sci-fi creativeness and wizardry we invest in future wars. It means connecting the intellectual work done in centers of war studies with research conducted in peace institutes, and applying to the task of avoiding war the long-term pragmatic reasoning we associate with “strategy.”