The next few years may offer humankind its last, best opportunity to avert resource wars, terrorism, and economic collapse as it enters the second half of the Age of Oil. If we grasp that opportunity and succeed, we could set a precedent for cooperative, peaceful approaches to all of the resource problems we are likely to encounter during the coming century. The choice we face is between competition and conflict on one hand, and voluntary moderation and mutual assistance on the other. The first steps toward the latter can be readily taken by endorsing and adopting this simple agreement.