'Building blocks' of human health face climate change threat

A new report says the 'basic building blocks' of human health are being threatened by the effects of climate change. The Royal Society Te Apaarangi warns climate change will worsen respiratory issues, drinking water contamination and mental health problems. Professor Alistair Woodward is an epidemiologist and biostatistician at University of Auckland, who contributed to the report. He joins us to explain the findings.