Exacerbating risk in human-ignited large fires over western United States due to lower flammability thresholds and greenhouse gas emissions.

PNAS Nexus · 2025 · PMC11812050 · PMID 39935590

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a positive trendP < 0.1so close (0.05 < p ≤ 0.1)

In conjunction with the increasing flammable days, a positive trend (20.1 kha year −2 , P < 0.1) of burned area was found in human-ignited large fires (Fig. 3 c), ∼2.6 times larger than that of lightning-caused large fires (5.6 kha year −2 , P > 0.1).

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