Fig. 3: Ecoregional distributions of fire occurrence in the historical and contemporary periods.

Percent of fire-scar sites burned in the historical (pre-1880) and contemporary (1984–2022) time periods for each ecoregion: Eastern Temperate Forests (a), Mediterranean California (b), North American Deserts (c), Northern Forests (d), NW Forested Mountains (e), Southern Semiarid Highlands (f), Taiga & Hudson Plain (g), and Temperate Sierras (h).