I just went through this big project with my wife, where we produced a podcast for Spokane, WA. We learnt of the big river cleanup in 1974. But I didn’t quite understand the process of how they did it. In general, how does this process work?
In: Planetary Science
Large scale: It doesn’t really. You just move problems downstream to the oceans.
Smaller scale: If you put more pollution in than the water can take out you get a nasty river. If you reduce/stop putting stuff other than water in the river, over time, the the water that feeds the lake or river, will wash the pollution down stream, improving the condition at that river/lake.
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