USC's US-China Institute writes: "During Chinese President Xi Jinping’s recent state visit to the U.S., energy policy took center stage as the world’s two biggest emitters of greenhouse gases outlined their shared desire for a global climate change agreement. Though the two countries might butt heads on economic and security issues, the agreement signals a new period of cooperation on climate issues. Kelly Sims Gallagher , director of The Fletcher Center for International Environment and Resource Policy and former senior policy advisor to the White House Office of Science and Technology Policy, is at the forefront of energy and climate issues affecting the U.S. and China. She is particularly interested in the role of policy in spurring the development and deployment of cleaner, more efficient energy technologies, domestically and internationally. US-China Today spoke with Gallagher about US-China climate policy and the most effective strategies for tackling this existential threat."