Peter Gleick, president, Pacific Institute, member, National Academy of Sciences, Oakland, Calif.
Larry Banks, consulting hydraulic engineer, Army Corps of Engineers, former chief of water management, Mississippi Valley Division, Winnsboro, La.
Ed Link, former director of research and development, Army Corps of Engineers, research professor, Department of Civil and Environmental Engineering, University of Maryland, College Park, Md.
Floodwaters are rising to record heights in the lower Mississippi, weeks before they're expected to crest. Ira Flatow and guests discuss how engineers have boxed in the river with dams, levees and spillways, and whether human-induced climate change might bring more frequent floods.