Even data that is stored and never used again takes up space on servers – typically huge banks of computers in warehouses.It is key to recognise that digitisation is not itself an environmental issue, but there are huge environmental impacts that depend on how we use digital processes in daily workplace activities.Using our calculations, a typical data-driven business such as insurance, retail or banking, with 100 employees, might generate 2,983 gigabytes of dark data a day.If they were to keep that data for a year, that data would have a similar carbon footprint to flying six times from London to New York.We hope this can reduce dark data production and contribute to the digital decarbonisation movement, which we will all need to engage with if net zero is to be realised."