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Abrupt, climate-induced increase in wildfires in British Columbia since the mid-2000s

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In the province of British Columbia, Canada, four of the most severe wildfire seasons of the last century occurred in the past 7 years: 2017, 2018, 2021, and 2023. To investigate trends in wildfire activity and fire-conducive climate, we conducted an analysis of mapped wildfire perimeters and annual climate data for the period of 1919–2021. Results show that after a century-long decline, fire activity increased from 2005 onwards, coinciding with a sharp reversal in the wetting trend of the 20th century. Even as precipitation levels remain high, moisture deficits have increased due to rapid warming and increased evaporative demand. Bottom-up factors further influence fire activity, as the legacy of past wildfires, insect outbreaks, and land-use practices continually influence fire regimes. The compound effects of climate-induced moisture changes and altered fuels now force British Columbians to confront the harsh reality of more frequent years of intense and prolonged wildfire activity.

M.A. Parisien; Q.E. Barber; M.L. Bourbonnais; L.D. Daniels; M.D. Flannigan; R.W. Gray; K.M. Hoffman; P. Jain; S.L. Stephens; S.W. Taylor; E. Whitman

Parisien M-A, Barber QE, Bourbonnais ML, Daniels LD, Flannigan MD, Gray RW, Hoffman KM, Jain P, Stephens SL, Taylor SW, et al. Abrupt, climate-induced increase in wildfires in British Columbia since the mid-2000s. Nature [Internet]. 2023 ;4(309). Available from:

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