Zero Tailpipe emissions. This is a dream. It’s a daily occurrence to see diesel engines belching out smoke. The smell of exhausts in the streets, particularly in cities at busy times of day. I have to repeat it…“zero tailpipe emissions”.

But are we just pushing the emissions back down the line? More power station emissions? There’s two things to consider here. Firstly the fossil fuel power stations are more efficient than millions of internal combustion engines. Secondly renewables and nuclear – both clean energy and an increasing proportion of electricity supply.