A recent study featured in Nature indicates that the escalating intensity of wildfires has resulted in over 30% of the Arctic Boreal Zone (ABZ)

The results are consistent with the National Oceanic and Atmospheric Administration (NOAA) 2024 Arctic Report Card. It emphasizes that the Arctic tundra, a region devoid of trees, is transitioning into a net carbon source, primarily due to rising temperatures and increasing wildfire occurrences in the Northern polar area.

The Arctic Boreal Zone (ABZ)

The ABZ is an essential area in the northern hemisphere, distinguished by its unique ecosystems and its crucial function in regulating global carbon cycles.

Geographical Location:

The ABZ extends across the Arctic Circle, encompassing regions of Alaska, northern Europe, and Siberia. It comprises tundra, coniferous forests, wetlands, and areas of permafrost.

Carbon Sink:

Historically, the ABZ has served as a vital carbon sink, absorbing substantial quantities of carbon dioxide (CO₂) from the atmosphere through its forests, soil, and permafrost. The tundra and wetlands within the ABZ sequester carbon in the form of organic matter preserved in permafrost, which aids in alleviating global warming.

Recent Wildfires:

In early 2025, several U.S. states, including Texas, Oklahoma, and California, along with Japan (specifically Ofunato), experienced severe wildfires. Although the number of forest fire hotspots in India has decreased, the frequency of fires remains high, particularly in Uttarakhand, Odisha, and Chhattisgarh. Increasing land temperatures and extended heat waves are contributing to the intensity of these fires.

Carbon Emissions:

Wildfires in January 2025 emitted 800,000 tonnes of carbon, nearly quadrupling the emissions from a decade earlier. Globally, wildfires are a significant source of carbon emissions, contributing approximately 69 million tonnes annually in India.

Carbon Sinks and the Arctic Boreal Zone (ABZ):

Oceans, forests, and soil function as carbon sinks; however, wildfires have compromised their capacity to absorb carbon. The ABZ, once a major carbon sink, has begun to emit carbon, particularly due to thawing permafrost and heightened wildfire activity. Currently, over 30% of the ABZ is releasing carbon, marking a reversal of its historical role as a carbon sink.