Fifty-two Bay Area public schools sit so close to the bay’s high-tide line that they’re already at risk of being inundated with ocean and ground water, and their risk will grow as seas continue to rise, according to an analysis by KQED and Climate Central. Some schools already cope with routine floods, like Marin County’s Redwood High School, which has installed a pump to keep its parking lot dry during high tides, and Mill Valley Middle School, where the drop-off zone floods multiple times a year. The high-tide line in the San Francisco Bay has risen by 8 inches as heat trapped by pollution has melted ice and heated and expanded the world’s oceans over the last century.