If the global temperature rises by 4degC over the next fifty years, as is evidently possible, the whole of the Appalachian wilderness below New England could become savanna. Already trees are dying in frightening numbers. The elms and chestnuts are long gone, the stately hemlocks and flowery dogwoods are going, and the red spruces, Fraser firs, mountain ashes, and sugar maples may be about to follow. Clearly, if ever there was a time to experience this singular wilderness, it was now.