Australia's dependence on the controversial weedkiller paraquat

Last month, after a nearly 30-year review, Australia's chemical regulator finally decided that the herbicide paraquat can continue to be used on Australian farms, with new precautions.That's despite bans on the chemical spreading around the world, amid concerns about the health impacts of repeated exposure. Why is Australia so dependent on the controversial weedkiller, and what are the supply chains for pesticides globally?Guest: Sarah Rogers, Associate Professor at the Asia Institute, University of MelbourneProducer: Jack Schmidt