Ona breezy spring day in 2013,1 gazed out upon a giant beach ball, tethered to the roof of a building adjacent to Old Street roundabout, north of the Square Mile. The eight-metre diameter red and yellow sphere wobbled away on a low-rise flat roof neighbouring the 16-storey White Collar Factory, being built by Derwent London. My companion was Derwent's inspirational development director, Simon Silver, who promised 180 tonnes of carbon dioxide would be saved from ascending into the troposphere each yearthanks to the sustainable design of the £200m tower. The beach ball's message? Filled with carbon dioxide instead of helium, it would have weighed a tonne.
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