Bleaching of Aotearoa sea sponges raises alarm

For the first time there has been a mass bleaching of native sea sponges in New Zealand waters, raising alarm about the impact climate change is having on marine ecosystems. The south of the South Island has been in the grip of an extreme ocean heatwave this summer, with April having the hottest ever water temperatures. The news comes on the day the Government finally releases its game plan to slash emissions. Climate reporter Hamish Cardwell has more.