Enlightening. It pains me to read what men have done to environments around the world. What animals and plants existed while men grew to civilization enters my imagination. What did the forests of classical Greece looked like before it became a rocky semi-arid "waste-land." What animals and birds dominated these lands? Osborn takes the reader on a journey visiting many areas of the world where the environment has been devastated by mankind, and he takes the reader on what steps are being done to counter-act mankind's environmental ignorance. This book was printed in the 1940s. ( )