“That transition is much more difficult than most people think it is, not the least because of the scale of the energy system and the trillions and trillions of dollars that have gone into developing that system. The world depends on that infrastructure, so replacing that infrastructure with something else is actually quite difficult. There is a real need to understand the complexity of the energy system overall.”

      —- Marvin Odum, outgoing president of Shell Oil Company, commenting on the time it will take for the world to transition to a new mix of energy sources focused on renewables and electricity and hydrogen after 300 years of relying on fossil fuels.