RIO DE JANEIRO, BRAZIL - For the third consecutive year, investment in basic sanitation has dropped.
The Tietê River, which flows through the country's most prosperous state, is a mirror of a receding Brazil. In 2017, investment in basic sanitation reverted to the 2011 level: R$11 billion (US$2.8 billion).
Researchers say that rivers are useful pointers for basic sanitation levels in . . .
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