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The documentary "Chasing Coral" tells the story of a three-year effort to capture the loss of the world's coral reefs through time-lapse, underwater photography.

The film focuses on the process called coral bleaching. When ocean water becomes too warm, corals become stressed and expel the algae living in their tissue causing the coral to turn completely white.

"The coral bleaches, and what you're seeing is the skeleton underneath."

Coral bleaching is happening more often as climate change raises the temperature of oceans, which have absorbed more than 90 percent of the heat created by man-made greenhouse gas emissions.

One area the film focuses on is Australia's Great Barrier Reef where the average ocean water temperature has warmed by about 1.2 degrees fahrenheit over the last century.

Jeff Orlowski directed "Chasing Coral".