The recent tragic events in the Gulf of Mexico offer a vivid reminder of the environmental risks involved with drilling at sea.

How much of our oil supply now comes and could come from offshore oil fields, especially deep-water ones? To the extent offshore drilling does occur, how can it be regulated to prevent another disaster? Panelists: Elizabeth Cheney, Robert Gagosian, Bruce Babbitt, Kevin Costner Moderator: Joel Achenbach