What are the scientific certainties and uncertainties in our climate future?

Steven Koonin, a University Professor at NYU, wrote the recent bestseller Unsettled: What Climate Science Tells Us, What It Doesn't, and Why It Matters. He has previously served as Under Secretary for Science at the U.S. Department of Energy (2009-2011), as Chief Scientist for BP (2004-2009) moving the firm into renewable energy, and as a professor at Caltech (1975 - 2004, the last nine years as the Institute's Vice President and Provost). Koonin is member of the U.S. National Academy of Sciences and the JASON group of government advisors, a Governor of Lawrence Livermore National Laboratory, a non-resident senior fellow of the American Enterprise Institute, and a Trustee of the Institute for Defense Analyses. He holds a BS in physics from Caltech and a Ph.D. intheoretical physics from MIT.

David M. Romps is a Professor of Climate Physics in the Department of Earth and Planetary Science at UC Berkeley and a Faculty Scientist in the Climate and Ecosystem Sciences Division at Lawrence Berkeley National Laboratory. Prof. Romps studies the fundamental physics of climate and educates students and the public about global warming. He received a B.S. in math and a B.S./M.S. in physics from Yale University and a Ph.D. in physics from Harvard University. Motivated by concerns about climate change, he left the field of string theory to work on climate policy at the Woods Hole Research Center and on atmospheric dynamics at Harvard's Center for the Environment. He then joined the faculty at UC Berkeley and currently teaches the popular course Introduction to Climate Change.