Bloomberg Wall Street Week: Summers & Ferguson

As the global elite gathers in Davos, Lawrence H. Summers and Roger Ferguson join "Bloomberg Wall Street Week" to discuss their own view of the world economy back in New York. When it comes to climate change, Summers doesn't think the leaders in Davos are doing enough. They sit down with David Westin along with JetBlue's Head of Sustainability and BofA's top media analyst.