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Tree's and plants create oxygen which is then released into the air and is what humans breathe to survive
Facility's that create cars, clothes, ETC use chemicals that (when used) will release dangerous chemicals into the air
Mixture (Oxygen + Carbon Dioxide)
Plants also need oxygen to survive so they absorb the carbon dioxide they might die.
Carbon dioxide comes from everywhere it can come from cars, houses, even humans breathe it out!
If tree's keep being cut down then there will be more carbon dioxide then oxygen and that is not healthy and dangerous.
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