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. cg9h7k8eRYKfCkQ88iNXjp6ADMskcw0E7/7W1QSANjI/5mgLXbfpWgSM0RvsBVu9