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. SJR/h7IKsCfLcslQ9fH6pHpWi4azBPc3/+GOAwg2CAiDGvQcrGdr28RTR7xG0ELz