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. 2017 Feb 27;114(11):2946–2951. doi: 10.1073/pnas.1617394114

Fig. 2.

Fig. 2.

Frequency distributions of human and lightning-caused wildfires by Julian day of year. (A) Frequency distribution of wildfires across the coterminous United States from 1992 to 2012 (n = 1.5 million); (B) map of United States ecoregions; (C) frequency distributions of wildfires by ecoregions, ordered by decreasing human dominance.