Edward Barrett is director of research at the U.S. Naval Academy's Stockdale Center for Ethical Leadership. An Air Force ROTC-scholarship graduate of the University of Notre Dame, he completed a PhD in political theory at the University of Chicago. While in graduate school, he worked for two years as speechwriter for the Catholic Archbishop of Chicago. After serving nine years as an active duty C-130 instructor pilot, he joined the Air Force Reserve and was recalled to active duty in 2003–2005 for Operation Iraqi Freedom. He recently retired as a Colonel from the Air Staff's Directorate of Strategic Planning. He is the author of Persons and Liberal Democracy: The Ethical and Political Thought of Karol Wojtyla/John Paul II (2010) and numerous journal articles on ethics and political theory. ebarrett@usna.edu

Douglas Bushey received his PhD from the University of California, Berkeley's Energy and Resources Group in 2013, and his JD from Berkeley Law in 2012. His work focuses primarily on the relationship between disputed scientific claims and environmental law and politics. He is currently an attorney adviser for the U.S. Environmental Protection Agency, and previously served as a trial attorney in the Environment and Natural Resources Division of the Department of Justice. The opinions expressed in his contribution are his own, and do not reflect the views of the Environmental Protection Agency or the U.S. government. douglas.bushey@gmail.com

Jonathan D. Caverley is associate professor of strategy in the Strategic & Operational Research Department of the U.S. Naval War College's Center for Naval Warfare Studies, and research scientist in political science and security studies at the Massachusetts Institute of Technology. He is the author of Democratic Militarism: Voting, Wealth, and War (2014), which examines the distribution of the costs of security within democracies and how this contributes to military aggressiveness. He is currently completing a book on the global arms trade and international order. jon.caverley@usnwc.edu

Mike Hulme is professor of human geography at the University of Cambridge. His work sits at the intersection of climate, history, and culture, with particular focus on how knowledge about climate and climate change is made and represented, and the numerous ways in which the idea of climate change is deployed in public discourse around the world. His books include Why We Disagree About Climate Change (2009) and, most recently, Weathered: Cultures of Climate (2016). He has held appointments at King's College London and the University of East Anglia, where from 2000 to 2007 he was the founding director of the Tyndall Centre for Climate Change Research. Since 2008 he has been the founding editor in chief of the review journal Wiley Interdisciplinary Reviews: Climate Change. mh903@cam.ac.uk

Sikina Jinnah is associate professor of politics at the University of California, Santa Cruz. Her research focuses on the shifting locations of power and influence in global environmental governance, and in particular the role of transnational actors in environmental decision-making. In her previous positions, Jinnah has held a postdoctoral fellowship at Brown University's Watson Institute for International and Public Affairs and was a consultant for the International Institute for Sustainable Development. Her books include Post-Treaty Politics: Secretariat Influence in Global Environmental Governance (2014), which received the 2016 Harold and Margaret Sprout Award for best book in international environmental affairs from the International Studies Association; and the edited volume New Earth Politics: Essays from the Anthropocene (2016, with Simon Nicholson). She is currently working on a third book, Trading the Environment, which examines the role of preferential trade agreements in securing environmental objectives. She also serves as an associate editor for the journal Environmental Politics, sits on the editorial board of the journal Global Environmental Politics, is a senior research fellow with the Earth System Governance project, and is an advisory board member of the Academic Working Group on International Governance of Climate Engineering at the Forum for Climate Engineering Assessment. sjinnah@ucsc.edu

James Turner Johnson is Distinguished Professor emeritus in the Department of Religion, Rutgers University. He has written eleven books dealing with Western moral and legal traditions on war and edited or coedited three others. His most recent books are Sovereignty: Moral and Historical Perspectives (2014) and The Ashgate Research Companion to Military Ethics (2015, edited with Eric Patterson). jtj@rci.rutgers.edu

Holly Lawford-Smith is senior lecturer in political philosophy at the University of Melbourne. Her PhD is from the Australian National University, and her undergraduate and Masters degrees are from the University of Otago, New Zealand. She teaches across ethics and political philosophy, and does research related to collective action, collective agency, and collective responsibility, with applications to climate change and consumption. She is currently interested in the question of whether citizens are culpable for their states' actions and, if so, what this may imply for a state passing on the costs of its ethical transgressions to citizens. Further information about her work can be found at www.hollylawford-smith.org. holly.lawford-smith@unimelb.edu.au

David Luban is University Professor at Georgetown University Law Center and the Distinguished Visitor in Ethics at the Stockdale Center for Ethical Leadership, U.S. Naval Academy. He writes on just war theory, professional ethics, international criminal law, and human rights. His most recent book is Torture, Power, and Law (2014), and he is currently writing a book on Hannah Arendt's moral and legal philosophy. Luban is a founding editor of the national security blog Just Security. luband@law.georgetown.edu

Valerie Morkevičius is associate professor of political science at Colgate University. She is the author of Realist Ethics: Just War Traditions as Power Politics (forthcoming, 2018), and has written numerous articles and book chapters, including, most recently, “Coercion, Manipulation, and Harm: Civilian Immunity and Soft War,” in Michael L. Gross and Tamar Meisels, eds., Soft War: The Ethics of Unarmed Conflict (2017). Her work focuses on the intersection between power and ethics, and the applicability of traditional just war thinking to contemporary challenges. vmorkevicius@colgate.edu

Janos Pasztor is currently senior fellow and executive director of the Carnegie Climate Geoengineering Governance Initiative (C2G2) at the Carnegie Council for Ethics in International Affairs. He holds a BS and MS from the Massachusetts Institute of Technology, and has over thirty-five years of work experience in the areas of energy, environment, climate change, and sustainable development. Before taking up his current assignment, he was UN Assistant Secretary-General for Climate Change under Secretary-General Ban Ki-moon. Prior to his appointment at the United Nations, he was acting executive director for conservation (2014) and policy and science director (2012–2014) at WWF International. His previous positions also include director of the UN secretary-general's climate change support team (2008–2010) and executive secretary of the UN secretary-general's high-level panel on global sustainability (2010–2012). jpasztor@c2g2.net

Christopher J. Preston is professor in the Department of Philosophy and research fellow at the Mansfield Center's Program on Ethics and Public Affairs at the University of Montana. He works in environmental philosophy, climate ethics, the ethics of emerging technologies, and feminist philosophy. He is author and editor of several books and more than three dozen articles in environmental philosophy, as well as the recipient of two National Science Foundation grants on ethics and emerging technologies and a Templeton Foundation grant for an intellectual biography he wrote of Holmes Rolston, III. He has served as an external reviewer for the IPCC and the Convention on Biological Diversity. In winter 2016–2017 he was the Distinguished Visiting Fellow in the Ethics of the Anthropocene at Vrije University in Amsterdam. His latest book is The Synthetic Age: Outdesigning Evolution, Resurrecting Species, and Reengineering Our World (forthcoming, 2018). christopher.preston@mso.umt.edu