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Environment

Global Surge in Extreme Wildfires: A Dire Warning from Scientists

Tuesday 25 June 2024 - 13:50

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The frequency and intensity of extreme wildfires have surged dramatically worldwide over the past two decades, driven by human-induced climate warming, according to a new study published Monday.

For the first time, researchers have mapped a global trend for the most devastating fires, which cause significant economic damage and loss of animal and human life. This groundbreaking study, appearing in the journal "Nature Ecology & Evolution", utilized satellite data to analyze nearly 3,000 wildfires of immense “radiative power” from 2003 to 2023. The findings reveal a staggering 2.2-fold increase in the occurrence of these extreme fires within this period.

The study also noted a dramatic rise in the intensity of the top 20 most severe fires each year, a rate that appears to be accelerating. "I expected to see some increase, but the rate of increase alarmed me," said Calum Cunningham, the study’s lead author from the University of Tasmania in Australia. "The effects of climate change are no longer just something of the future. We are now witnessing the manifestation of a drying and heating atmosphere," Cunningham conveyed via email to AFP.

The six most extreme years in terms of wildfire intensity and frequency have all occurred since 2017, with 2023 experiencing the most severe wildfire intensities of the period studied.

Geographic Hotspots and Climatic Feedback

The rise in extreme wildfires has been particularly pronounced in specific geographic clusters, including North America, northern parts of Eurasia, and Australia. Temperate conifer forests, which span the western United States, saw an 11-fold increase in extreme fires over the past two decades. Similarly, Earth’s northernmost forests, which encompass regions in Alaska, Canada, and Russia, experienced a more than seven-fold rise.

These increasingly tinder-dry conditions, which fuel massive fires, have been directly linked to the changing climate. However, the impact of fires extends beyond immediate destruction. Forests, which play a crucial role in absorbing carbon from the atmosphere, release significant amounts of CO2 when they burn. This exacerbates global warming, creating a vicious "feedback effect," according to Cunningham. "It also blankets large regions in smoke, causing major health effects including many more premature deaths than are caused by the flames themselves," he added.

Urgency of Climate Adaptation

The study underscores the urgent need for adaptation strategies to cope with a climate that increasingly favors extreme wildfires. Cunningham emphasized the importance of improved forest management at a local level to mitigate the risk of major wildfires.

As the planet continues to warm, the findings of this study serve as a stark reminder of the tangible and immediate impacts of climate change. The evidence is clear: extreme wildfires are becoming more frequent and intense, and the time to act is now.