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Neal Flanagan, right, a research scientist at Duke University, uses a tool to take a soil sample from a peatland as Curt Richardson, an ecology professor at Duke, observes Wednesday, May 6, 2026, in Belhaven, N.C. (AP Photo/Joshua A. Bickel)

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Curtis Richardson, an ecology professor at Duke University, holds peat soil Wednesday, May 6, 2026, in Belhaven, N.C. (AP Photo/Joshua A. Bickel)

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A beaver swims in a creek at the Pocosin Lakes National Wildlife Refuge, Wednesday, May 6, 2026, in Belhaven, N.C. (AP Photo/Joshua A. Bickel)

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Neal Flanagan, a research scientist at Duke University, carries soil sampling tools Wednesday, May 6, 2026, in Belhaven, N.C. (AP Photo/Joshua A. Bickel)

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Neal Flanagan, a research scientist at Duke University, displays real-time carbon dioxide emissions from a sensor Wednesday, May 6, 2026, in Belhaven, N.C. (AP Photo/Joshua A. Bickel)

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Water fills an irrigation ditch with repaired drainage structures Tuesday, May 5, 2026, in Belhaven, N.C. (AP Photo/Joshua A. Bickel)