. . . "Children's television programs" . "Documentary films"@en . . . "Juvenile works"@en . "Juvenile works" . "The planet's untouched natural environments are shrinking, due to pressure from human populations. As these areas decline, the creatures adapted to live in them face a decline in numbers, and sometimes even extinction altogether." . "The planet's untouched natural environments are shrinking, due to pressure from human populations. As these areas decline, the creatures adapted to live in them face a decline in numbers, and sometimes even extinction altogether."@en . . "Nonfiction films"@en . "Motion pictures"@en . . "Motion pictures" . . "Nonfiction television programs" . . . "Extreme environments. Extinction"@en . "Extreme environments. Extinction" . "Children's films"@en . . . . . . . . . "Educational television programs" . . "Our planet's untouched natural environments are shrinking, due to pressure from human populations. As these areas decline, the creatures adapted to live in them face a decline in numbers, and sometimes even extinction altogether. Many biologists believe that if we don't act quickly, half the world's species will be gone in 100 years. A report called the Living Planet Index reveals that from 1970 to 2000, populations of terrestrial and marine species dropped by 30 percent, while freshwater populations went down by a massive fifty percent."@en . "Extinction"@en . "Extinction" . "Educational films"@en . . . . "Extinction (Biology)" . .