How can people or animals modify the grand canyon

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!
U posted it twice!?!

Primary sources are usually  more accurate and are written by someone who experienced it or witnessed it. secondary sources are those who heard of it after the fact that can lose details and or twist the event in a light that benefits them.