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. B4dtSAa4bGE8ZV0fVaD8uiBN8/uFhJG3yCvq1aTsD6yM8F4io4erwI7Q2lo30WoN