Hope on Earth is the thought-provoking result of a lively and wide-ranging conversation between two of the world's leading interdisciplinary environmental scientists: Paul R. Ehrlich, whose book The Population Bomb shook the world in 1968 (and continues to shake it), and Michael Charles Tobias, whose over 40 books and 150 films have been read and/or viewed throughout the world. Hope on Earth offers a rare opportunity to listen in as these deeply knowledgeable...