The U.S. Department of Energy (DOE) is responsible for safeguarding U.S.  nuclear infrastructure, maintaining energy security, fostering technology innovation, and guiding the country towards a green energy transition.  Today, the DOE is facing converging crises: climate change, global supply chains still impacted by the pandemic, and the Russian invasion of Ukraine. So, what can the federal government do to sustainably shore up the country's energy sector?  To answer that question, host Jason Bordoff speaks with David Turk, deputy secretary of energy at the DOE and former deputy executive director of the International Energy Agency. Jason and David discuss the war in Ukraine, the future of clean energy technology, and what energy security looks like in a decarbonizing world.