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  "path": "/articles/s41586-025-10039-5",
  "publishedAt": "2026-02-18T21:10:00.497Z",
  "site": "https://www.nature.com",
  "tags": [
    "doi:10.1038/s41586-025-10039-5"
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  "textContent": "Nature, Published online: 18 February 2026; doi:10.1038/s41586-025-10039-5\n\nNitrogen isotope tree-ring chronologies show that rising atmospheric CO2 has reduced nitrogen availability in boreal forests in Sweden, suggesting that elevated atmospheric CO2 is causing oligotrophication in boreal forests.",
  "title": "Rising atmospheric CO<sub>2</sub> reduces nitrogen availability in boreal forests",
  "updatedAt": "2026-02-18T00:00:00.000Z"
}