Many rivers in the Tropic of Cancer have lost biodiversity. The water is not safe, and some places are facing endangered species. These species are crucial, for example, frog ( eat insects, which naturally remove certain harmful one), snail, birds. Rivers in the Tropic of Cancer, in particular, large desert regions are salty, several salty lakes are nearly dry.

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The number of birds have decreased significantly over the past decade. Hikers, forest rangers can’t rely on river water, because of contamination.

Washington, USA