Obviously CO2 in the atmosphere has an impact on global temperature. The question is how much, how quickly, whether the feedback loops are quite what people say they are. […] I think probably decarbonisation over time is worth doing for all kinds of reasons, but I’m not convinced that it’s essential at the expense of all other goals to reach net zero in 2050, and you know of course it’s only Europe and the US that has set that goal, other countries around the world have set more relaxed goals than that.