The author is aged over 90 and has had a long career making documentaries on life on this planet. Yes, the DVDs are well worth seeing. He is making the point that population growth and expanding the economy has resulted in devastation of much of the wildlife, both animal and vegetable, within his lifetime. Oceans are now polluted with plastic refuse. Climate is being changed by an increase of carbon dioxide in the atmosphere. This is one of the biggest moral problems to ever arise for humanity. Buy it! Read it! Read it again! Tell your friends!