I’ve just arrived at the Newseum, where one of the first “war games” to tackle the subject of global warming will play out over the two and a half days. About 45 participants from around the world have converged in Washington, D.C., for the exercise, organized by the Center for a New American Security (CNAS). It began with cocktails and dinner last night, along with a discussion about global warming policy and the purpose of such “scenario planning” exercises. Take home lesson? The future tends to be a surprising place.