Forget the feds -- we'll make our own deals. The Oakland airport seems perfectly situated. Unlike many urban airports, which require an expensive taxi trip or hour-long train ride to reach the city where you thought you'd just arrived, downtown lies mere minutes away. Such convenience is possible because the runways sit on a former wetland at the edge of San Francisco Bay. But this prime location could prove costly. We're all intimately familiar with the basic global-warming scenario by now: greenhouse gases are warming the atmosphere, polar ice caps are melting, sea levels are rising -- and coastal cities …