These images are a selection of photos taken recently near Lizard Island off the north Queensland coast in Australia. They document the ongoing bleaching on the Great Barrier Reef as ocean temperatures continue to be driven upward by climate change.
The bleaching process Before corals bleach, they are often a deep brown or khaki-green colour. These colours come from the symbiotic algae (sometimes called zooxanthellae) that co-exist with the coral polyp.
