When Lewis and Clark crossed through Montana, they encountered an extraordinary cornucopia of wildlife. Most of that ecosystem and the animals that once thrived there are gone. But a non-profit wants to bring it all back. Pete Geddes, Managing Director of the American Prairie Reserve talks with EconTalk host Russ Roberts about creating the Serengeti of the Americas--a 3.3 million acre prairie that would allow bison, pronghorn antelope, prairie dogs and their friends to inhabit a Wildlife Reserve in Montana, the size of Connecticut. Geddes discusses the goals of the American Prairie Reserve and how they're using a for-profit company, Wild Sky Beef, to gather support and help from local ranchers for the project.

There is only one country in the world where a person can sell a kidney to another citizen who buys it. That country is Iran. Tina Rosenberg of The New York Times talks with EconTalk host Russ Roberts about the Iranian kidney market--how it works, its strengths and weaknesses, and whether its lessons apply to the United States or elsewhere.

Ever wonder what goes on behind the scenes at a Broadway show? This week's EconTalk lifts the curtain on the magical world of Broadway: Mitch Weiss, co-author of The Business of Broadway, talks with EconTalk host Russ Roberts about his book and what it's like to manage the production of a blockbuster musical in New York City. Topics discussed include the eight-performance-per-week grind, the how and why of creating a Broadway set, the challenges of wardrobes (domestic and international) and the pluses and minuses of unions which are a central part of the Broadway workplace.

How much care do you take when you make a donation to a charity? What careers make the biggest difference when it comes to helping others? William MacAskill of Oxford University and the author of Doing Good Better talks with EconTalk host Russ Roberts about the book and the idea of effective altruism. MacAskill urges donors to spend their money more effectively and argues that the impact on human well-being can be immense. MacAskill wants donors to rely on scientific assessments of effectiveness. Roberts pushes back on the reliability of such assessments. Other topics include sweatshops, choosing a career to have the biggest impact on others, and the interaction between private philanthropy and political action.

Are human beings naturally cooperative or selfish? Can people thrive without government law? Paul Robinson of the University of Pennsylvania and author of Pirates, Prisoners and Lepers talks with EconTalk host Russ Roberts the ideas in his book. Robinson argues that without government sanctions or legislation, there is an evolutionary drive to cooperate even in life-and-death situations. In such situations private punishment and norms play a crucial role in sustaining cooperative solutions. The last part of the conversation deals with the criminal justice system and how attitudes toward the system affect society-wide cooperation and crime.

Thousands of bears in New Jersey. Humpback whales near New York City. Acres devoted to farming stable or declining even as food production soars. Jesse Ausubel of the Rockefeller University talks with EconTalk host Russ Roberts about the return of nature. Ausubel shows how technology has reduced many of the dimensions of the human footprint even as population rises and why this trend is likely to continue into the future. The conversation concludes with Ausubel's cautious optimism about the impact of climate change.

Rachel Laudan, visiting scholar at the University of Texas and author of Cuisine and Empire, talks with EconTalk host Russ Roberts about the history of food. Topics covered include the importance of grain, the spread of various styles of cooking, why French cooking has elite status, and the reach of McDonald's. The conversation concludes with a discussion of the appeal of local food and other recent food passions.

Summer Brennan, author of The Oyster War, talks with EconTalk host Russ Roberts about her book and the fight between the Drakes Bay Oyster Company and the federal government over farming oysters in the Point Reyes National Seashore. Along the way they discuss the economics of oyster farming, the nature of wilderness, and the challenge of land use in national parks and seashores.

Seafood is highly perishable and supply is often uncertain. Roger Berkowitz, CEO of Legal Sea Foods talks with EconTalk host Russ Roberts about the challenges of running 34 seafood restaurants up and down the east coast. Berkowitz draws on his 22 year tenure as CEO and discusses how his business works day-to-day and the question of sustainability.

How important are basic skills for economic success and growth? Eric Hanushek of Stanford University's Hoover Institution talks with EconTalk host Russ Roberts about the importance of basic education in math and literacy and their relationship to economic growth. Hanushek argues that excellence in educating people in basic skills leads to economic growth, especially in poorer countries where years of education may be a poor proxy for learning. He argues that the U.N.'s Millennium Development Goals should emphasize outputs rather than inputs--performance on skill-based exams rather than years of education.