America’s rivers are changing color — and people are behind many of the shifts, a new study said.
One-third of the tens of thousands of mile-long (two kilometer-long) river segments in the United States have noticeably shifted color in satellite images since 1984.
Great Lakes Now
https://www.greatlakesnow.org/2021/01/ap-one-third-of-americas-rivers-have-changed-color-since-1984/