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A human-driven decline in global burned area.

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Global fire activity has significantly decreased over the last 18 years, primarily driven by agricultural expansion. This trend impacts ecosystems, atmospheric composition, and carbon cycling, with current fire models potentially overestimating future emissions.

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Area of Science:

  • Earth System Science
  • Ecology
  • Atmospheric Science

Background:

  • Fire is a critical Earth system process influencing ecosystems and atmospheric composition.
  • Understanding long-term fire trends is crucial for climate and ecological modeling.

Purpose of the Study:

  • To assess global long-term fire trends using multiple satellite datasets.
  • To identify the primary drivers of observed changes in burned area.
  • To evaluate the implications of fire trends on aerosol concentrations, vegetation structure, and the terrestrial carbon sink.

Main Methods:

  • Analysis of multiple satellite-derived burned area datasets over an 18-year period.
  • Statistical adjustments for precipitation variability to ensure robustness of findings.
  • Correlation analysis with economic and demographic variables to identify drivers of fire trends.

Main Results:

  • Global burned area declined by 24.3 ± 8.8% over the past 18 years.
  • The decline was most pronounced in savanna ecosystems and robust after accounting for precipitation.
  • Agricultural expansion and intensification were identified as primary drivers of reduced fire activity.

Conclusions:

  • Observed fire declines suggest current fire models may overestimate future emissions.
  • Reduced fire activity has significant implications for aerosol levels, vegetation, and the terrestrial carbon sink.
  • A conceptual model integrating economic and demographic factors can predict fire dynamics in human-influenced landscapes.