Given the Great Barrier Reef is about the size of Japan or Italy, and there are millions of dollars being invested in improving the runoff of water flowing off the land, how do we know if reef projects are actually working?

Fiona Barron is the coordinator of the Paddock to Reef Program in the Wet Tropics, which tracks progress against targets in Australia’s Reef 2050 Water Quality Improvement Plan. In this podcast she explains how scientists have developed the world’s most comprehensive monitoring and modelling program.