Your comment made me think of something different, I wonder how much regulations and taxes prevent people from having more money they could put in to renewables - essentially a free-market environmentalism question

how much are non-renewables necessary because of the cost of regulations... I suppose the question doesn't have a definitive answer as we don't know how much tech would develop without such regulations, although you might be able to estimate losses due to current taxes / regs and what could be spent on current tech