early 20 years ago, the British mathematician Clive Humby coined a snappy phrase that has turned into a platitude: “data is the new oil”. He wasnt wrong. We have an insatiable appetite for data, we cant stop generating it, and, just like oil, its turning out to be bad news for the environment. So the Guardian set me a challenge: to try to give a sense of how much data an average person uses in a day, and what the carbon footprint of normal online activity might be. To do that, I tried to tot up...

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