A new report, the Reef Outlook Report, says that climate change will cause huge damage to the reef. The report was written by the Great Barrier Reef Marine Park Authority. Warmer and more acidic water around the coral reef will slow down calcification, which is how the coral grows and becomes strong. The corals will become bleached (lose their colours) and many species that live on and around the reef will be in danger. The Australian government has already spent AU$325 million to improve the health of the reef in the last two years.