Palo Alto Online: If greenhouse gas emissions continue at their current rate the San Francisco Bay will inundate 240 square miles of area lowlands, including East Palo Alto, San Francisco Airport and parts of Silicon Valley, by the end of the century. Intense floods that historically occurred once a century will come once a decade and Northern California will experience more and larger wildfires, as it already has. This scenario was painted by policy planners and scientists Wednesday at a …