Professor Mara Prentiss speaks at Harvard on the possibility of an “energy revolution”:

Update, 2016-08-16

Although I am not a PhD professor like Professor Prentiss, nor am I associated with an institution as esteemed as Harvard University, I disagree with her point regarding the need for natural gas, based upon my studies of the solar energy business during the last two years. I also assuredly hope that is not the only way to transition to zero Carbon energy, because from what I know of the climate science, we could be in very, very serious trouble if we need to go through an intermediate CO₂-spewing step which will persist for another few decades.