Low-income favelas would benefit from green roofs but there are two problems: Cost. And a typical design that's too heavy for a favela home.

Ian Cheibub for NPR It was a sunny September morning in Rio de Janeiro’s Parque Arará favela and volunteers were preparing plants to be placed on Reginaldo Gomes da Silva’s roof. Students ...

It was a sunny September morning in Rio de Janeiro's Parque Arará favela and volunteers were preparing plants to be placed on Reginaldo Gomes da Silva's roof. Students from both the neighborhood ...

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