America's Energy Future: No More Fossil Fuels by 2050?br The Aspen Institute - Paepcke Auditoriumbr The 2012 Aspen Ideas Festival presents U.S. Energy Future: The 'Rational Middle' Will Find Solutions, a panel discussion featuring Richard G. Newell, Russ Ford, Gregory Kallenberg, and Alexis Karolides. Chrystia Freeland moderates.