Our current Environment Minister, Sussan Ley (number four to try the job), has just reannounced, for the umpteenth time, our commitment to capturing blue carbon greenhouse gases in mangroves, marshes and seagrasses. It’s a worthwhile endeavour, as it was when Julie Bishop made the same announcement in 2017. These systems are not just valuable because of the carbon they capture, they are valuable for a whole multitude of reasons around fisheries, around coastal protection, around supporting our marine biodiversity. But they are under threat. Since European settlement in Australia, we’ve lost about 25% of our sea grasses, 50% of our tidal marshes, somewhere between 50% and 70% of our mangroves, and that loss is continuing.