New research finds that coastal lands are dropping by several millimeters per year and losing elevation.
“Three millimeters a year seems like a really tiny number,” says Ohenhen, but what really matters is “the cumulative effect of how much sinking will occur over the years.” And it could get worse, he predicts. “The East Coast is one of the fastest-growing areas for the US in terms of population. When you have more population, it means people will use more water, and that will increase how fast the land is sinking.
People are also already destroying the wetlands that mitigate sea-level rise along the East Coast, in order to develop over them. Wetlands absorb storm surges, keeping seawater from reaching farther inland. As sea levels have naturally gone up and down over the millennia, wetlands have moved inland and back in response. “But now we have put a hard stop by building a ‘fence’—our buildings and whatever—so wetlands can no longer migrate landward,” says Ohenhen.
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