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Climate Change and Our Cities Geoff Watts returns with a new series of Leading Edge, and talks to Salvano Briceno, Director of the United Nations International Strategy for Disaster Reduction, about a meeting being held this week looking at the threat of natural disasters on our rapidly swelling urban communities. NASA Row National Public Radio’s David Kestenbaum gives his thoughts on a climate change kerfuffle caused by comments made by NASA chief, Michael Griffin, last week. Tracking the Walrus Rebecca Morelle joins the crew of a scientific vessel off the coast of Greenland, as they attempt to uncover where the walrus migrates to over the summer. The walruses have been tagged, and are being tracked by satellite. Astronauts and Zero Gravity Geoff Watts visits the University of Maryland, to see a giant swimming pool, that is being used to train astronauts on the effects of zero gravity.