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Area of Science:

  • Climate Science
  • Earth System Science
  • Environmental Science

Background:

  • Greenhouse gas warming intensifies fire-prone weather, affecting global carbon budgets and carbon-climate feedbacks.
  • The efficacy of negative emissions in mitigating fire weather and associated carbon emissions remains uncertain.

Purpose of the Study:

  • To analyze fire weather responses in carbon dioxide (CO2) removal climate model experiments.
  • To estimate potential carbon emissions from exacerbated fire danger under negative emissions scenarios.

Main Methods:

  • Utilized CO2 removal climate model experiments to assess fire weather changes.
  • Estimated CO2 emissions using an observational relationship between fire weather and fire-induced CO2 emissions.

Main Results:

  • Enhanced fire danger under global warming cannot be instantaneously reversed by CO2 reduction due to climatic inertia (atmospheric dryness).
  • Exacerbated fire danger is projected to cause additional CO2 emissions in 68% of global regions because of climate response hysteresis.
  • Increased fire activity may reinforce the fire-carbon-climate feedback loop, even under global cooling.

Conclusions:

  • Negative emissions may not rapidly restore fire weather conditions to pre-warming levels.
  • Hysteresis in climate responses to CO2 levels means increased fire danger can persist, leading to further CO2 emissions.
  • Fire activity under negative emissions scenarios could exacerbate socio-economic damage through reinforced fire-carbon-climate feedbacks.