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Chief Almir of Brazil's Surui tribe attends a press conference with Google representatives in Rio de Janeiro last year. Chief Almir has brought technology to his previously isolated people, who now use smartphones to send photos of illegal logging in the Amazon.
Vanderlei Almeida /AFP/Getty Images
The city of Gladstone near the Great Barrier Reef is the world's fourth largest coal-export hub. Dredges, like one seen here, have turned the harbor brown as they work to expand the coal port.
Ken Caldeira of the Carnegie Institution for Science takes a water sample during his experiment out on part of the Great Barrier Reef. The water is slightly pink because his team is using a dye to trace an acid-neutralizing chemical as it flows across the reef.