Mrs Catcher is my social conscience, C5. She'd agree with a lot of what you say. The environmental cost of mineral extraction, manufacture and transport of new cars and the environmental cost of scrapping used cars tend to outweigh any perceived environmental gains, at least in the short-medium term. However, in the long term, as EVs become the norm in replacing cars that rech the end of their natural the benefits will snowball. In short, keeping an older car on the road is better for the environment but when it has to be replaced choosing an EV is the most environmentally friendly option. Grant aid schemes arguably offer benefits in accelerating the process through influencing perception as much as anything else.