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Oil extraction is neither a clean nor simple process. Alongside the desired crude, vast quantities of water and natural gas are produced from oil wells. In 2019, 75% of the 935 billion cubic metres (bcm) of gas emitted – so-called ‘associated gas’ – was captured on-site, estimates the International Energy Agency (IEA). It was then either used to power the extraction site, reinjected into the well or stored and later sold to consumers.