Wildfires and carbon emissions are significant contributors to climate change, as they release stored carbon into the atmosphere. This can have a detrimental impact on global climate goals. In particular, boreal forests are highly vulnerable to climate change, and fires in these ecosystems can release vast amounts of carbon into the atmosphere. Human activities also play a major role in wildfire ignition.

Rising Wildfires Accelerate Global Warming by Releasing Stored Carbon

The severity and frequency of wildfires are increasing, worsening global warming and posing significant risks to various regions. Forests play a crucial role in capturing carbon from the atmosphere and storing it in trees and soils. Over time, some of this carbon ends up on the ground as fallen litter and accumulates in the soil, which serves as one of the largest carbon reservoirs on Earth. In fact, soils store more carbon than the atmosphere and the combined aboveground biomass.

However, when forests burn, significant amounts of this stored carbon are released into the atmosphere. Although vegetation in burned areas can regrow and absorb some of the carbon again, the recovery process can be slow or incomplete. This is especially true in regions where tropical forests are replaced by agricultural land, leaving the unrecovered carbon to linger in the atmosphere and contribute to climate change.

The picture below will help you better understand how wildfires and carbon emissions create a feedback loop that threatens climate goals:

Wildfires, particularly in ecosystems such as boreal forests, can heat up the planet. Boreal forests, which store more carbon than any other terrestrial ecosystem, reduce atmospheric carbon dioxide levels and help mitigate climate change.

A NASA study revealed that fires in Canada’s boreal forests in 2016 consumed millions of acres of trees and scorched the rich organic soils, releasing vast amounts of carbon into the atmosphere. The situation is further complicated by the fact that for every degree the planet warms, boreal forests need a 15 per cent increase in precipitation to offset the growing dryness.

To understand these fires better, It is important to acknowledge the different types of wildfires, such as ground fires, surface fires, and crown fires, and their causes, including natural and human-induced factors.

Types of Wildfires

Before going further, let’s take a look at the different types of wildfires:

1. Ground fires smoulder deep below the soil in areas rich in organic matter. They are especially difficult to control, often spreading below the surface, making it harder to extinguish them due to their ability to smoulder for long periods of time, even across seasons.
2. Surface fires burn dry vegetation above ground. Although less intense, surface fires can still destroy vegetation layers crucial for soil health and wreak havoc by consuming dry vegetation on the forest floor.
3. Crown fires are the most destructive, burning through the leaves and canopies of trees. They spread rapidly through forest canopies, fueled by dry branches and trees. They are particularly common in coniferous forests, fueled by dry foliage and creating the infamous “ladder effect,” where flames move from the ground to the canopy.

Also Read: Understanding the Temperature of Rainforests

Causes of Forestfire

There are two major causes of forest fires:

1. Natural Causes of Wildfires

Lightning is the leading natural cause of wildfires, with two main types: cold and hot. Cold lightning is typically brief and rarely ignites fires. In contrast, hot lightning, characterized by lower voltage but prolonged duration, generates intense heat and is responsible for most naturally occurring wildfires.

2. Human-induced Wildfires

Human activities are also major contributors to wildfires, whether through accidents or deliberate actions. Common causes include open burning from campfires, equipment malfunctions, engine failures, debris burning, and careless disposal of cigarettes on dry ground. Intentional acts of arson are also a significant driver of wildfires, ranking among the most common human-related ignition sources.

To grasp how wildfires and their carbon emissions create a feedback loop that threatens global climate goals, it’s helpful to look at real-world examples from around the globe. In the next section, we’ll dive into the severity of these wildfires and their impact on carbon emissions.

Also Read: How Does Wildfire Smoke Affect Us?

How Severe are the Wildfires’ Carbon Emissions?

A recently published report highlights ten extreme forest fire incidents between 2018 and 2023, each of which emitted over 600 million tonnes of CO2. These incidents were concentrated in five forest-rich countries: Russia, Brazil, Canada, Australia, and Indonesia. While fire is a natural part of the forest cycle, the increasing severity and frequency of wildfires are exacerbating global warming. Fires release carbon that forests have stored for centuries, and the damage is further amplified if vegetation does not fully recover.

In the Western United States, climate change has significantly raised wildfire risks by increasing temperatures and reducing soil moisture. Wildfire risk is influenced by several factors, including the availability of dry organic matter, which serves as fuel, and climate conditions. Between 1984 and 2015, climate change more than doubled the number of large fires in the Western United States by drying out forests, creating ideal conditions for wildfires to ignite and spread rapidly.

Source: Nature

According to the Chinese Academy of Sciences, global forest fires emitted a staggering 33.9 billion tonnes of carbon dioxide between 2001 and 2022. This annual figure exceeds Japan’s total CO2 emissions from fossil fuels, highlighting the growing impact of extreme fire events. Wildfires, also known as uncontrolled fires that spread in rural vegetation, are not limited to specific ecosystems—they can occur in forests, grasslands, savannas, and even Arctic tundra. The rise in the number of wildfires has been linked to climate change, which dries out organic material and fuels fire outbreaks.

The frequency of wildfires has increased globally, from Australia to the Arctic, destroying vast areas of land, displacing people, and devastating entire ecosystems. Arctic wildfires are of particular concern because of the region’s rapid warming. Between 2019 and 2020, 4.7 million hectares of the Arctic were burned, emitting 146 million tonnes of carbon. The Arctic, already experiencing an average temperature increase of over two degrees Celsius since the pre-industrial era, could see more large fires even before the 2050s due to rising temperatures.

In 2023, wildfires in Canada released four times more carbon dioxide than planes did globally that year. These fires scorched an area larger than the U.S. state of West Virginia, causing severe environmental damage and contributing significantly to global warming. In addition to the greenhouse gas emissions, the fires also had immediate health consequences, as smog from the fires caused cities like New York to experience dangerously poor air quality.

Source: Nature

Conclusion

Addressing the growing wildfire crisis requires immediate and coordinated action. Wildfires not only contribute to climate change by releasing stored carbon into the atmosphere, but they also pose direct threats to biodiversity, human health, and livelihoods. As seen in Canada’s 2023 wildfire season, the fires’ impacts go far beyond destroyed forests, with long-term environmental and health implications for people living far from the actual fires.

Mitigating climate change and reducing wildfire risk must be done simultaneously. National and global strategies should prioritize sustainable land use and forest management. Early warning systems, real-time detection, and better fire control techniques are essential to curbing wildfire outbreaks. Additionally, Indigenous knowledge and local community participation can offer valuable insights into managing fires sustainably and reducing their devastating effects.

Ultimately, the effects of wildfires and carbon emissions extend far beyond the regions they burn. As the 2023 Canadian wildfires showed, environmental crises have no boundaries. New York City’s orange skies, choked with smoke from fires burning thousands of miles away, were a stark reminder of how interconnected we are and why immediate action is needed to prevent future wildfire disasters.

Also Read: What Are The Causes Of Forest Wildfire: An Analysis