John Christy of the University of Alabama in Huntsville and Kerry Emanuel of the Massachusetts Institute of Technology talk with EconTalk host Russ Roberts about climate change. Topics discussed include what we know and don't know about global warming, trends in extreme weather such as hurricanes, rising sea level, the likely change in temperature in the next hundred years. Both scientists also give their perspective on what policies might be put in place to reduce risk from climate change. This episode was recorded before a live audience at the College of Business Administration at the University of Alabama in Huntsville.

Jeffrey Sachs of Columbia University and the Millennium Villages Project talks with EconTalk host about poverty in Africa and the efforts of the Millennium Villages Project to fight hunger, disease, and illiteracy. The project tries to achieve the Millennium Development Goals in a set of poor African villages using an integrated strategy fighting hunger, poverty, and disease. In this lively conversation, Sachs argues that this approach has achieved great success so far and responds to criticisms from development economists and Nina Munk in her recent EconTalk interview.

Richard Epstein, of New York University and Stanford University's Hoover Institution, talks with EconTalk host Russ Roberts about the differences between classical liberalism and hard-line libertarianism. What is the proper role of the state? Topics discussed include the Constitution, prudent regulation, contract enforcement, intellectual property, and the Supreme Court case, Lochner vs. NY.

Moises Velasquez-Manoff, author of An Epidemic of Absence, talks with EconTalk host Russ Roberts about his book--a discussion of why allergies and autoimmune diseases have been on the rise in the developed world for the last half-century. Velasquez-Manoff explores a recent hypothesis in the epidemiological literature theorizing the increase is a response to the overly hygienic environment in rich countries and the absence of various microbes and parasites. Velasquez-Manoff also considers whether reintroducing parasites into our bodies can have therapeutic effects, a possibility currently under examination through FDA trials. The conversation continues a theme of EconTalk--the challenge of understanding causation in a complex world.

Robert Frank of Cornell University talks with EconTalk host Russ Roberts about the implications of Ronald Coase's views on externalities. Drawing on his book, The Darwin Economy, Frank explores the implications of Coase's perspective for assessing public policy challenges where one person's actions affect others. Examples discussed include pollution, cigarette smoking and related issues.

Charles Calomiris of Columbia University and Stephen Haber of Stanford University, co-authors of Fragile by Design: The Political Origins of Banking Crises and Scarce Credit, talk with EconTalk host Russ Roberts about their book. The conversation focuses on how politics and economics interact to give some countries such as Canada a remarkably stable financial system while others such as the United States have a much less stable system. The two authors discuss the political forces that explain the persistence of seemingly bad financial regulation. The conversation includes a discussion of the financial crisis of 2008.

Paul Sabin of Yale University and author of The Bet talks with EconTalk host Russ Roberts about his book. Sabin uses the bet between Paul Ehrlich and Julian Simon--a bet over whether natural resources are getting scarcer as population grows--as a lens for examining the evolution of the environmental movement and its status today. Sabin considers the successes and failures of the movement and the challenges of having nuanced public policy discussions on issues where both sides have passionate opinions.

Erik Brynjolfsson of MIT and co-author of The Second Machine Age talks with EconTalk host Russ Roberts about the ideas in the book, co-authored with Andrew McAfee. He argues we are entering a new age of economic activity dominated by smart machines and computers. Neither dystopian or utopian, Brynjolfsson sees this new age as one of possibility and challenge. He is optimistic that with the right choices and policy responses, the future will have much to celebrate.

Nina Munk, journalist and author of The Idealist: Jeffrey Sachs and the Quest to End Poverty, talks with EconTalk host Russ Roberts about her book. Munk spent six years following Jeffrey Sachs and the evolution of the Millennium Villages Project--an attempt to jumpstart a set of African villages in hopes of discovering a new template for development. Munk details the great optimism at the beginning of the project and the discouraging results after six years of high levels of aid. Sach's story is one of the great lessons in unintended consequences and the complexity of the development process.

Jonathan Haidt of New York University and author of The Righteous Mind talks with EconTalk host Russ Roberts about his book, the nature of human nature, and how our brain affects our morality and politics. Haidt argues that reason often serves our emotions rather than the mind being in charge. We can be less interested in the truth and more interested in finding facts and stories that fit preconceived narratives and ideology. We are genetically predisposed to work with each other rather than being purely self-interested and our genes influence our morality and ideology as well. Haidt tries to understand why people come to different visions of morality and politics and how we might understand each other despite those differences.