Dr. Nate Hagens, University of Minnesota, provides a view of the world through three lenses: Energy, Environment, and Human Behavior. Dr. Hagens believes how people view these three lenses are going to shape the world in years leading up to when the population grows to 9 billion people.Take away: Money is a marker for energy and natural resources. In the long run energy is what we have to budget and spend! And: We need technology… But not new gadgets.