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COP26 talks in Glasgow are now into overtime as negotiators from nearly 200 countries try to strike a deal on tackling climate change.

Sticking points include subsidies for coal and other fossil fuels, and financial help to poorer nations.

We will calibrate the achievements at COP26 over deforestation, methane and promised billions in private investment, against the failure - so far - to agree globally on Net Zero by 2050?

Political editor Nick Watt reports.