Defining Moments

Defining Moments: Capturing our changing world

JULY 31 - NITEROI, BRAZIL - JULY 30: A man walks along the polluted waters of Guanabara Bay, the future site of sailing events during the Rio 2016 Olympic Games. Rio's Olympic bid included the promise to clean up the bay. But officials say only a third of Rio's sewage is currently treated, while the remainder flows untreated into the waters.

JULY 31 - NITEROI, BRAZIL - JULY 30: A man walks along the polluted waters of Guanabara Bay, the future site of sailing events during the Rio 2016 Olympic Games. Rio's Olympic bid included the promise to clean up the bay. But officials say only a third of Rio's sewage is currently treated, while the remainder flows untreated into the waters.