Trees, says Wangari Maathai, are not super-heroes. Let’s soak that up for a nanosecond. Not just another green message from just another loudmouth. For one, Wangari Maathai is no loudmouth. And then, this is a message that will stay relevant as long as there are trees and there is life. If not, it will read like an excellent epitaph on the tombstone of our planet.