Britain’s plans to decarbonise the economy have not been properly thought through, and there is a dangerous lack of systems and project engineering input. That’s according to Michael Kelly, emeritus professor of technology in the Department of Engineering at the University of Cambridge, who says that replacing fossil fuels with electricity from renewables is impractical on the timescale of 2050.“It’s clear that there has been little or no systems engineering input into the plans. How can we possibly proceed further along the renewables path when we lack any technology to store electricity at scale? How can we hope to electrify transport when we would need to consume the whole global annual supply of several important minerals to do so, just for the UK?” And Professor Kelly warns that the costs of decarbonising will be ruinous of our current standards of living.