The Elders' Mary Robinson was the first female President of Ireland. She has spent decades fighting climate change. One Decision's Julia Macfarlane gets her take on China, Biden, & whether a world weary from COVID can rally the strength to make the sacrifices necessary to reduce carbon emissions. Plus the former head of the British spy agency Sir Richard Dearlove on the serious security and stability implications we are likely to see emerge from environmental issues in the coming years.