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Contributed to basic philosophical research, to current, pressing issues about climate change, and to issues at the intersection of moral philosophy and economics. Contributions include field-shaping work on the nature of rationality and its relations to reasons and reasoning. His Rationality Through Reasoning (2013), builds on an earlier series of essays. His Scientific American essay on the ethics of climate change was reprinted in The Best American Science and Nature Writing (2008). It was followed by Climate Matters: Ethics in a Warming World (2012). His Weighing Goods (1991) asks how we should arrive at an overall value of a particular distribution of well-being across different persons, and how we should arrive at an overall value of a particular distribution of well-being across different times in the life of a single person. His Weighing Lives (2004) extends the conclusions to include an account of the value of extending lives and the value of creating new lives. Fellow, British Çï¿ûÊÓƵ; Foreign Member, Royal Swedish Çï¿ûÊÓƵ of Sciences; Fellow, Royal Society of Edinburgh.