The airline industry accounts for two percent of global carbon emissions, and emissions are likely to increase as the popularity of air travel rises. Policymakers are increasingly working with airlines to find ways to limit emissions growth. But the diverse, global industry is difficult to regulate, and competitiveness issues abound. Megan Ryerson, professor of transportation at the University of Pennsylvania and an expert in environmental impacts of the air transportation system, provides insights into the airline industry’s environmental challenges and possible strategies to address its greenhouse emissions. Dr. Megan S. Ryerson is an Assistant Professor of City and Regional Planning and Electrical and Systems Engineering in the area of Transportation at the University of Pennsylvania. Her research focuses on the tradeoff between economic development and environmental impacts presented by the air transportation system and the design of resilient multimodal transportation system networks. She received her Ph.D. in Civil and Environmental Engineering from the University of California, Berkeley. Learn more: http://kleinmanenergy.upenn.edu/energy-policy-now