The endless struggle to clean up Rio de Janeiro’s highly polluted Guanabara Bay

The endless struggle to clean up Rio de Janeiro’s highly polluted Guanabara Bay

At eight in the morning, the sun is already scorching the avenues and shopping malls of Barra da Tijuca, an upper-middle-class neighborhood on the west side of Rio de Janeiro. From the scalding runway of a busy private airport, helicopters transport tourists and executives along one of the most beautiful and renowned coastlines in the world. One of these helicopters is preparing to take off as Mario Moscatelli settles into the passenger seat and…