Professor Lazarus of Harvard Law School suggests some structural and cultural reasons that climate policy has proved so politically poisonous in America.

Dr. Meine talks about the life and work of Aldo Leopold, including the influential "Sand County Almanac" and the notion of sustainability as a "land ethic."

Professor Jason Hill talks about why biofuels might actually be bad for the environment, depending on how, and from what, they are made.

Professor Eric Hanushek of Stanford on quality teaching, the effectiveness of incentive-based pay, and how to close the educational achievement gap in the US.

Rohitesh Dhawan, a resource economist at KPMG, on new developments in the international climate policy arena, as well as South Africa's new domestic carbon tax.

Hemant and Jisung talk about what it means to be in the Clean-Tech Venture Capital business and how the sector is evolving in response to legislative uncertainty, as well as the recent financial crisis.

Ngaire Woods talks about the challenges of regulating international finance and proposes some essential regulatory reforms.

Sol Hsiang of Princeton University discusses how the global climate affects the prevalence of violent civil conflicts, as well as economic output and other measures of human productivity

Omprakash founder and director, Willy Oppenheim, on international volunteering and economic development.

Gernot Wagner, Economist at EDF and author of the new book But Will the Planet Notice?, talks about how smart economic policies can do much more than the "green" behavioral modifications so often championed by environmentalists.