When people cut down too many trees,it causes ______., pollution , deforestation , extinction , Animals that are in danger of disappearing are called ______ species., protected, endangered , melted, Factories often ______ the air and water., protect, save, pollute, The opposite of ** appear ** is ________., disappear, melt, change, If something is no longer alive on Earth, it is ________., extinct , endangered , produced.

Environmental problems

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