Bioengineers are creating human body parts to replace organs and manage life-threatening diseases. How techniques like 3-D printing and stem cell research are driving medical advances and raising ethical questions
Former Vice President and Nobel Prize Winner Al Gore is challenging the nation to clean up its energy act. A look at the goals he’s laid out and the feasibility of undertaking a major shift to renewable and clean energy sources in just ten years.
- David Conover counsel, National Commission on Energy Policy; formerly at the Department of Energy as director of the agency's climate change technology program and as principal deputy assistant secretary for policy and international affairs; former staff director and chief counsel of the U.S. Senate Environment and Public Works Committee
- Andrew Revkin covers the environment for "The New York Times" and writes the paper's "Dot Earth" blog; author, "The North Pole Was Here: Puzzles and Perils at the Top of the World"
- Cathy Zoi CEO of the Alliance for Climate Protection, a group founded by Al Gore to campaign for action on climate change.
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