Daniel H Janzen As a Guest 1 segment Queue May 6, 1988 10:00 Preserving Tropical Forests. Biologist Daniel H. Janzen's dream is to create a tropical forest in the northwest of Costa Rica. Janzen is a professor at the University of Pennsylvania. (Interview by Marty Moss-Coane) Interview Daniel H Janzen
Queue May 6, 1988 10:00 Preserving Tropical Forests. Biologist Daniel H. Janzen's dream is to create a tropical forest in the northwest of Costa Rica. Janzen is a professor at the University of Pennsylvania. (Interview by Marty Moss-Coane) Interview Daniel H Janzen