Approximately 75% of the world's coral reefs are threatened — that's why these scientists are mapping their color by sea and sky.
As three-fourths of the world's coral reefs are at risk, researcher Greg Asner uses various methods to monitor and map them — both underwater and from the sky.
'When we talk about the health of a coral, often we're talking about its color,' he explains. 'But, what color really is, is chemical composition.'
Mapping coral color can help in conservation efforts, as well as in identifying areas that need additional protection.
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