Nick Butler is a visiting professor at King's College London and a former senior executive at energy company BP.
So-called border tax adjustments are really just a new generation of tariffs


Black smoke emitted from a coal-fired power plant in Jharkhand: the growth in Indian emissions is likely to offset any gains made in Europe. © LightRocket/Getty Images
Nick Butler is a visiting professor at King's College London and a former senior executive at energy company BP.