Ros Atkins on... What have climate summits achieved?

Nations at the UN climate summit have for the first time taken explicit aim at the use of fossil fuels. At the COP28 talks in Dubai nations agreed to "transition away" from coal, oil and gas.

But this is far from the first global climate agreement.

The BBC's analysis editor Ros Atkins examines what effect 30 years of COPs has had on efforts to halt climate change.