It is already more than three years since the Paris Climate Agreement (COP21) saw all countries of the world pledge to keep global warming at less than 2°C more than pre-industrial levels and, if possible, to step up their efforts so as to limit this increase to 1.5°C by 2100. The European Union, which has ratified it, has set itself the official targets of reducing greenhouse gas emissions by 40% compared to 1990 figures by 2030, producing 32% of its energy consumption from renewable...