Unit 9 Protecting the environment

D_ _ _ _ _ S _ _ _ _ _ _ means cutting down trees. (13 letters)

E_ _ _ _ _ _ _ E _ animals are animals that might disappear. (10 letters)

P _ _ _ _ _ _ _ _ is when the air, water, or land gets dirty.

C_ _ _ _ _ _ C _ _ _ _ _ means changes in the world's weather, especially an increase in temperature. (13 letters)

W _ _ _ L _ _ _ means animals and plants that grow in natural conditions. (8 letters)

G _ _ _ _ _ W _ _ _ _ _ _ is when the Earth gets hotter because of human activities. (13 letters)