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. v8AVtsbhM6J73YsjK9MB0Logi58xqrphRt5BmQxJW9wJv5bztN7glt0cYNRPeSK3