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Want to prevent California’s looming flood disaster? Grow a marsh.

Grist

As they walled off rivers and created dry islands from what was previously soggy marsh, they discovered incredibly rich soil. No one foresaw that this very bounty — soil rich with organic material — would, over time, become a curse of sorts. When Jones Tract, a delta island, flooded in 2004, the damage cost $90 million to fix.

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