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The
say the worst-hit rivers are in
Europe and North America. This is because these
have large and rich towns and cities. The lead researcher said: "Rivers which have the most
development around them, like the Mississippi River, are the most
impacted." The River Thames in London was one of the worst-affected rivers in the
. The least-impacted rivers are in Africa and Australia. The researcher said: "This is
due to a slower rate of industrialisation in Africa and
population density around rivers in Australia." He added that rivers in
rich nations are unrecognisable compared with how they were 200 years
.