Mark Brownstein, vice president of the Climate and Energy Program at the Environmental Defense Fund, discussing "Energy Challenges of the Next Century" at Penn State Energy Days.
Tom Richard (left), director of the Penn State Institutes of Energy and the Environment, and Neil Sharkey, Penn State's vice president for research, at the conclusion of Penn State Energy Days.
William F. Hederman Jr., counselor to the director and senior advisor to the secretary of the U.S. Department of Energy, speaking at Penn State Energy Days.