In the last hundreds of years, humans have destroyed and polluted the earth at a fast pace. Remember that we need oxygen to survive. Plants use energy from the sun for photosynthesis in order to make oxygen.

Unfortunately, we are chopping down large amounts of forest land faster than it is being replanted. The number of plants able to make oxygen is decreasing and our atmosphere is suffering.

Explore Space ... Not Drugs!
Hear what astronauts have to say about staying drug-free.
Last modified: Tue May 12 17:16:34 PDT 1998

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