I interpreted his "liquidate them" comment to mean basically forcing the companies to break apart and sell everything off, (perhaps seizing all their assets judicially). So, presumably, we'd still have a bunch of oil companies, but they wouldn't be the ones we have now, or nearly as powerful, and their current owners would all be up a creek.
Oh come on. Enough sunlight hits the earth in an hour to power worldwide consumption for a year.
It takes an infinitesimal amount of land if you were going to use solar alone [1]. There is enough wind power potential in the US midwest, from North Dakota to Texas, to power the entire US 4x over [2]. There's enough generation capacity to move 77% of light vehicles in the US over to electric immediately. There's plenty of energy to go around.
Fun fact: The latest budget bill that passed at the end of 2015 had one of the largest subsidies (ITC production tax credit) for solar and wind generation installation ever.
