It is a better world with some buffalo left in it, a richer world with some gorgeous canyons unmarred by sign boards, hot-dog stands, super highways, or high-tension lines, undrowned by power or irrigation reservoirs. If we preserved as parks only those places that have no economic possibilities, we would have no parks. And in the decades to come, it will not be only the buffalo and the trumpeter swan who need sanctuaries. Our own species is going to need them, too. It needs them now.