The United Nations' COP climate talks are "no longer fit for purpose" and need an urgent overhaul, key experts including a former UN secretary general and former UN climate chief have said.

"Its current structure simply cannot deliver the change at exponential speed and scale, which is essential to ensure a safe climate landing for humanity," said its signatories. They include former UN Secretary General Ban-Ki Moon, former UN climate chief Christiana Figueres and former president of Ireland Mary Robinson.

The authors are concerned that the current COP process is not able to make change happen quickly or able to force countries to act.

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