The world has lost almost a fifth of its coral reefs , states a new report . Climate change , overfishing and coral mining all are contributing to destruction . LONDON , England ( CNN ) -- In some parts of Indian Ocean up to 90 percent of reef life has died .
The world has lost almost a fifth of its coral reefs , states a new report . Climate change , overfishing and coral mining all are contributing to destruction . In some parts of Indian Ocean up to 90 percent of reef life has died .