Making a marsh out of a mud pile
The water in California’s San Francisco Bay could rise more than two meters by the year 2100. For the region’s tidal marshes and their inhabitants, such as the endangered Ridgway’s rail and the salt marsh harvest mouse, it’s a potential death sentence. Given enough time, space, and sediment, tidal marshes can build layers of mud and decaying vegetation to keep up with rising seas. Unfortunately, upstream dams and a long history of dredging bays and dumping the sediment offshore are starving many tidal marshes around the world of the sediment they need to grow. To keep its marshes above water, San Francisco Bay needs more than 545 million tonnes of dirt by 2100.
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