This week’s EnergyTradeoffs.com podcast episode features Columbia’s Mike Gerrard talking with Shelley Welton about his research on “Deep Decarbonization: Legal Impediments to a Massive Renewables Build-Out.” In the interview, Mike explains why dramatic cutting U.S. greenhouse gas emissions will require a massive build out of new zero-carbon power sources to 1) replace coal and gas power plants and 2) electrify the other parts