Cop26: the time for prevarication is over | Katharine Viner

Glasgow 2021 must be the moment when the promise of Paris 2015 becomes real - history will not forgive us otherwise

Summits do not always live up to the name. They can get bogged down in detail and disagreement, never really reaching altitude.

That is often the case with the annual UN climate summits known simply as the Cop, which have earned a reputation since the first was held 26 years ago for being bewildering marathons that overrun and underdeliver.

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