Whenever I think about the obsticals to progress, such as whether there’s enough material to build the solar panels necessary to decarbonise, I cast my mind back to what experts say about the speed at which we’d get a Covid-19 vaccine. In early 2020, the estimate was 2 years to get a vaccine developed, tested, and distributed: those eggs need to come from somewhere. And what happened? We ended up getting the fastest vaccine ever made. Necessity always breeds innovation. You just need to find that necessity.