At this week’s ARPA-E Energy Innovation Summit near Washington, ARPA-E director Arun Majumdar made a compelling case for energy as the single most important challenge of our time.

“The future of the United States of America,” he said, “depends on three securities: national security, economic security, and environmental security. And the foundation of all these are innovations in energy technologies.”

The Advanced Research Projects Agency-Energy, or ARPA-E, is the mad scientist research arm of the Department of Energy, modeled on the wildly successful Department of Defense agency, DARPA.

Listen to Majumdar’s complete keynote address and jump to key points by clicking on my notes above. Click the play button and then wait for the audio to finish loading before clicking the notes.