Ali Garrigan, currently one of six Greenpeace activists climbing exterior of The Shard, has compared the rise in temperatures in London to that of the Arctic.
Near the top thinking about the 1.4 degree rise here and the 10 degree rise in the Arctic. Scary. #IceClimb
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Sir Bernard Hogan-Howe's decision to retire comes after growing speculation about his future and his relationship with mayor Sadiq Khan.
Sir Bernard Hogan-Howe is to retire after five years as the Commissioner of the Metropolitan Police, according to Scotland Yard.
The curtain will come down on the show for the final time at the Piccadilly Theatre in March next year, before embarking on a UK tour.