Climate activists are pushing back on a contentious shoreline housing project in the South Bay city of Newark. By building there, the activists believe, the city will miss an opportunity to restore sensitive wetlands and areas for them to migrate to as seas rise. Marshes are the region’s first line of defense against rising seas, and the Bay Area has just 15% of its wetlands left. Environmental advocates want these ecosystems protected. … Scientists project seas could rise by at least 1 foot by 2050 and as much as 7 feet by 2100 because global emissions are still increasing. A recent study by researchers with the British Antarctic Survey suggests that rising sea levels will speed up this century no matter if the world curbs emissions.