Restoring degraded ecosystems — or creating new ones — has become a huge global business. China, for instance, is planting 90 million acres of forest in a swath across its northern provinces. And in North America, just in the past two decades, restoration projects costing $70 billion haveattempted to restore or re-create 7.4 million acres of marsh, peatland, floodplain, mangrove, and other wetlands.

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