Medical and demographic information is used to explain that population growth is exceeding world food supply. Section on birth rate. Two boys walk through a field next to a stream. Shot of hanging Christian cross, Zen yinyang, Jewish Star of David, and Islamic moon. Shot of city and night. Overlaid writing explains that modern and old birth and survival rates are vastly different, such that population growth has vastly expanded. Graphs chart birth and death rates against worker output. Shot of teenaged couple outside.