To the people whose labors go beyond ideas into the realm of “real materials”—to the dry-land ecologists, wherever they may be, in whatever time they work, this effort at prediction is dedicated in humility and admiration. v32ElP635ddV1q0r2aue3U1hUApfHuDRzE3tRiP/CUPd2k/fNQ8siyK8i47EEDuS