Losses from catastrophic events such as hurricanes can be extensive. The economic losses from the 2005 hurricane season, which included Hurricanes Katrina and Rita, were $200 billion, the costliest season ever. For some threats, such as sea level rise, only the projected economic losses are indicated. For example, the vast majority of our nation’s commercial and recreational fisheries are dependent on coastal marshes. Approximately two-thirds of those fisheries spend some stage of their lives in tidal marshes. As sea levels rise, the built-up areas behind these marshes will provide no opportunities for wetlands to migrate. The net result will be billions of dollars in economic impacts affecting the livelihoods and sustainability of many coastal communities....