There are diverse views about what an energy system that stabilizes GHG emissions at 2° of warming could look like. But aside from particular conservation measures and ratios of fuel sources, what are the key beliefs and assumptions about what it will take to get there? Many see the core job as putting a price on carbon and making methodical investments in “least cost” reductions. Others place more faith in the profit motive and technology breakthroughs. Others think about the future differently altogether. This one-hour discussion will present cutting-edge perspectives on the theory and practice of creating a sustainable energy future.