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So that we can all live healthy lives.
Two kinds of Water pollution is acid and garbage.
Pollution affects waterfalls because pollution goes through air and can actually fly into water and rivers, which causes water pollution that can somewhat spread. This kills algae and fish and it kills our clean source of water.
People can stop pollution by reducing the usage of cars especially when their destination is just a few blocks away. Practicing proper recycling, avoid using products with chlorofluorocarbon or CFC, and stop smoking.
Pollution should stop because if it doesn't, the world could be in great danger by pollution using up all the air and we would'nt be able to breath. If we stop now, the world would be a much better place.