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. RByqyiPmGo25dRYWWwDvViwCwOHvrnSQEzKc75RQ/68smjN8QYFrYJIKsf1EFn5/