As the fractious COP26 ground to an end in Glasgow I was reminded of the disaster of COP15 in 2009. That was the first time I paid attention to the event and I thought the acronym was related to the Danish capital, where it was held.

It is not. COP is Conference of the Parties run by the UN Framework Convention on Climate Change and the number tracks the sequence since the first "Earth Summit" in Rio de Janeiro in 1992...

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