The robotics cleaning Sydney Harbour

Australia’s busiest waterway, Sydney Harbour hosts thousands of commuter ferries, recreational yachts and around 1200 commercial vessels each year. But boats burn fuel - and globally, shipping accounts for 3% of carbon emissions. And whilst the commuter ferries here are to be replaced with electric ones in the next decade, BBC Click’s Nick Kwek has been to meet a local startup that’s already using robotics to clean up our waters.