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
More top news
The review will look at how the city would cope if multiple terror attacks were launched.
Eric's been performing his impressive stunts at Clissold Park and even skates the half pipe.
The unusual sight caused quite a stir on Twitter.