Back-to-back bleaching events have highlighted the critical threat that climate change poses to the Great Barrier Reef. But few people are aware of the network of gullies pumping out about half the sediment that is polluting reef water quality and threatening its World Heritage status.
These gully networks are like miniature Grand Canyons, some with walls up to 20 metres high. They make a spectacular sight but are a disaster for the land, the reef and the rivers that connect them.
