Private jets, cars, cow farts – we all know things that are really bad for the planet. And then there's digital advertising. A recent report from Purpose Disruptors suggests that advertising adds a further 32 % to the annual carbon footprint of each person in the UK, with a significant chunk coming from the significant computing power required to power online advertising campaigns. It means a typical advertising campaign emits around 5.4 tonnes of carbon dioxide – more than half of what the average UK consumer produces in a year. (Claire Gleeson-Landry)

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