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A
shows that humans have damaged 86 per cent of the world's
. The study is from a
in France. Researchers examined
on over 2,500 of the world's rivers. They did not look at rivers in the Arctic and Antarctica or in deserts. The
looked at changes to
over the past 200 years. Biodiversity in over
of rivers has been seriously damaged by humans. There are many
for this damage. A big reason is the new species of
that are in rivers. Other reasons include pollution, dams, overfishing, farming and
change.
