World leaders have gathered in Brazil for the COP-30 climate summit - 30 years after the first UN talks on global warming. Despite decades of pledges, emissions are still rising and the world is on track to breach the 1.5-degree limit within a few years. This year's summit aims to agree on new climate plans, more finance for poorer nations, and stronger action to adapt to a rapidly heating planet.Guest: Christiana Figueres, former head of the U-N Convention on Climate Change, and now co-founder of Global Optimism, which works for social and environmental changeProducer: Anne Barker

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