Climate change: are you an expert? [Quiz]

Tom Nichols is Professor of National Security Affairs at the US Naval War College, an adjunct professor at the Harvard Extension School, and a former aide in the U.S. Senate. He is also the author of several works on foreign policy and international security affairs, including The Sacred Cause, No Use: Nuclear Weapons and US National Security, Eve of Destruction: The Coming Age of Preventive War, and The Russian Presidency. Nichols also authored The Death of Expertise: The Campaign Against Established Knowledge and Why it Matters.

He is also a five-time undefeated Jeopardy! champion, and as one of the all-time top players of the game, he was invited back to play in the 2005 Ultimate Tournament of Champions. Nichols can be found on Twitter at @RadioFreeTom.

Joseph Romm, Ph.D., is one of the country's most influential communicators on climate science and solutions. Romm is Chief Science Advisor for "Years of Living Dangerously," which won the 2014 Emmy Award for Outstanding Nonfiction Series. He is the founding editor of Climate Progress, which New York Times columnist Tom Friedman called "the indispensable blog." In 2009, Time named him one of its "Heroes of the Environment," calling him "The Web's most influential climate-change blogger." In 2009, Rolling Stone put Romm on its list of 100 "people who are reinventing America." Romm was acting assistant secretary of energy in 1997, where he oversaw $1 billion in low-carbon technology development and deployment. He is a Senior Fellow at American Progress and holds a Ph.D. in physics from MIT. Romm is the author of Climate Change: What Everyone Needs to Know®.