“Energy is the most pressing issue. If you have clean abundant energy, you can solve all today’s problems: You can turn the Sahara into a garden, you can desalinate salt water, you can pump it wherever you want to have it. Cheap energy can develop the world. A barrel of oil — one hundred and fifty-nine liters — contains the physical capacity of what twelve men would have to work for over a year. It’s really the key to our time.”