Humans bring in lots of impact such as new species, waste, and air pollution. This affects many things in the grand canyon. The water has become dirty and the air is polluted. Sometimes people and animals come into the park that can disturb other things in the canyon. Some areas have been affected by loud noises. The rumbling of aircraft passing by and wildland fire suppression.
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Hope this helps!
Short term: Humans cause waster and air pollution and animals can disturb the peace such as airplanes overhead the canyon!
