What do you do when the sea comes for your home, your school, your church?

You could try to hold back the water. Or you could raise your house. Or you could just leave.

An estimated 600 million people live directly on the world’s coastlines, among the most hazardous places to be in the era of climate change. According to scientific projections, the oceans stand to rise by one to four feet by the end of the century, with projections of more ferocious storms and higher tides that could upend the lives of entire communities.

Many people face the risks right now. Two sprawling metropolitan areas offer a glimpse of the future. One rich, one poor, they sit on opposite sides of the Pacific Ocean: the San Francisco Bay Area (population 7 million) and metropolitan Manila (almost 14 million).

Their history, their wealth, and the political and personal choices they make today will shape how they fare as the water inevitably comes to their doorsteps.

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