“The most important book on climate science in decades.”
— Rupert Darwall, RealClearPolitics

“The book is no polemic. It’s a plea for understanding how scientists extract clarity from complexity. And, as Mr. Koonin makes clear, few areas of science are as complex and multidisciplinary as the planet’s climate.”
— Mark P. Mills, Wall Street Journal

“Any reader would benefit from its deft, lucid tour of climate science, the best I’ve seen.”
— Holman W. Jenkins, Wall Street Journal

“Fascinating and informative reading, and one hopes it will improve the climate for honest and open discussion.”
— Jonathan Tennenbaum, Asia Times

“Koonin points out scientific facts supported by hard data and the peer-reviewed literature.”
— Tilak Doshi, Forbes

“We have too many global warming books―but this one is needed. Steven Koonin has the credentials, expertise, and experience to ask the right questions and to give realistic answers.”
— Vaclav Smil, distinguished professor emeritus at the University of Manitoba

“Unsettled is an excellent case study on climate science, its inherent complexity and uncertainty, and a cautionary tale on how interpretive filters in the policymaking process have shaped, and sometimes misinformed, the climate policy debate. It should on be the reading list of scientists and engineers whose responsibility, as citizens, extends beyond the laboratory to communicating to a larger public often overwhelmed and confused by the media. Policymakers and politicians will find it a source of reflection for their arguments, positions, and decisions.”
— Jean-Lou Chameau, President Emeritus, Caltech

“Essential reading and a timely breath of fresh air for climate policy. The science of climate is neither settled nor sufficient to dictate policy. Rather than an existential crisis, we face a wicked problem that requires a pragmatic balancing of costs and benefits.”
— William W. Hogan, professor of global energy policy at Harvard Kennedy School

“Tough talk about climate politics from a statesman scientist―and a vision of what will actually come to pass.”
— Robert B. Laughlin, professor of physics at Stanford University

“Steve Koonin, the undersecretary for science under Obama, has written a very interesting and thoughtful book on climate. He documents how much of what you think you know about climate just ain’t so. Did you know that while the United States is now seeing many fewer cold records, absolute heat records are not increasing? Unsettled will definitely and rightly unsettle your climate thoughts, and all for the better. If we are to make trillion dollar investments, we deserve to be as well informed as possible.”
— Bjørn Lomborg, president of Copenhagen Consensus and visiting fellow at The Hoover Institution at Stanford University

　　★TOP 1 bestseller among books on climatology, weather and river science.
　　★Rights sold: mainland China, Korea.
　　★Highly acclaimed by Wall Street Journal, Forbes and other media.
　　★Written by Dr. Steven E. Koonin, a leader in science policy in the United States, who served as Undersecretary for Science in the US Department of Energy under President Obama.

　　When it comes to climate change, the media, politicians, and other prominent voices have declared that "the science is settled." In reality, the long game of telephone from research to reports to the popular media is corrupted by misunderstanding and misinformation. Core questions—about the way the climate is responding to our influence, and what the impacts will be—remain largely unanswered. The climate is changing, but the why and how aren't as clear as you've probably been led to believe.
　　Now, one of America's most distinguished scientists is clearing away the fog to explain what science really says (and doesn't say) about our changing climate. In Unsettled: What Climate Science Tells Us, What It Doesn't, and Why It Matters, Steven Koonin draws upon his decades of experience—including as a top science advisor to the Obama administration—to provide up-to-date insights and expert perspective free from political agendas.

　　Dr. Steven E. Koonin is a leader in science policy in the United States. He served as Undersecretary for Science in the US Department of Energy under President Obama, where he was the lead author of the Department's Strategic Plan and the inaugural Quadrennial Technology Review (2011). With more than 200 peer-reviewed papers in the fields of physics and astrophysics, scientific computation, energy technology and policy, and climate science, Dr. Koonin was a professor of theoretical physics at Caltech, also serving as Caltech's Vice President and Provost for almost a decade. He is currently a University Professor at New York University, with appointments in the Stern School of Business, the Tandon School of Engineering, and the Department of Physics. Dr. Koonin's memberships include US National Academy of Sciences, the American Academy of Arts and Sciences, and the JASON group of scientists who solve technical problems for the US government. Since 2014, he has been a trustee of the Institute for Defense Analyses and chaired the National Academies' Divisional Committee for Engineering and Physical Sciences from 2014-2019. He is currently an independent governor of the Lawrence Livermore National Laboratory and has served in similar roles for the Los Alamos, Sandia, Brookhaven, and Argonne National Laboratories.
　　Fascinating, clear-headed, and full of surprises, this book gives readers the tools to both understand the climate issue and be savvier consumers of science media in general. Koonin takes readers behind the headlines to the more nuanced science itself, showing us where it comes from and guiding us through the implications of the evidence. He dispels popular myths and unveils little-known truths: despite a dramatic rise in greenhouse gas emissions, global temperatures actually decreased from 1940 to 1970. What's more, the models we use to predict the future aren't able to accurately describe the climate of the past, suggesting they are deeply flawed.
　　Koonin also tackles society's response to a changing climate, using data-driven analysis to explain why many proposed "solutions" would be ineffective, and discussing how alternatives like adaptation and, if necessary, geoengineering will ensure humanity continues to prosper. Unsettled is a reality check buoyed by hope, offering the truth about climate science that you aren't getting elsewhere—what we know, what we don't, and what it all means for our future.