“…First, numerous studies document the rapid cost declines of renewable energy [42][43][44], the feasibility of large scale deployment of zero emissions technologies including renewables, biomass, hydro, and nuclear [43,45,46], the overall modest macroeconomic costs such a program would entail [43,47,48], and the significant co-benefits of widespread zero carbon deployment [49,50]. Challenges remain, both on cost and grid integration [51,52], but large-scale deployment of zero carbon electricity appears inevitable; the question is not if but how fast.…”