As global leaders and environmental activists descend on Brazil for next week’s Cop30 climate summit, Madeleine Finlay speaks to the Guardian’s global environment editor, Jon Watts, who recently sat down for an exclusive interview with the UN secretary general, António Guterres. As he approaches his penultimate summit as the UN chief, Guterres reflected on humanity’s progress in attempting to limit global warming to 1.5C above pre-industrial levels, why Indigenous voices must be listened to and how he remains positive in the face of the climate crisis. Help support our independent journalism at theguardian.com/sciencepod

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