Our Climate Models Are Missing a Crucial Thing: Ecosystem Emissions

For decades, climate scientists have been warning the world about the positive feedback loops created by global warming. These vicious cycles, where rising temperatures from burning fossil fuels trigger further warming on their own, are one of the most critical elements of the Dünya system. To understand these mechanisms, scientists use climate models that simulate how the atmosphere, oceans, and land areas will respond to different emission scenarios. While some feedback mechanisms, such as the loss of sea ice, have been successfully integrated into the models, others, like changes in cloud cover, remain uncertain. However, the most complex is the increase in the amount of greenhouse gases released into the atmosphere by ecosystems, and this factor is often entirely excluded from the models.

For example, how much extra carbon dioxide increasing forest fires will release into the atmosphere, or how much methane melting permafrosts and wetlands will emit, is a huge uncertainty. Surprisingly, these natural emissions triggered by warming are either not included at all or are very weakly represented in the most influential climate models that guide the assessments of the Birleşmiş Milletler Hükümetlerarası İklim Değişikliği Paneli (IPCC). While the northern tundras have functioned as a carbon sink absorbing carbon for thousands of years, they have now turned into an emission source due to fires and melting permafrosts. This modeling gap is a serious risk that could lead countries to a false perception of how much fossil fuel they can burn before missing their climate targets.

A new study conducted by leading climate researchers reveals that the modeling knowledge gap could cause an overshoot of the Paris İklim Anlaşması's targets. According to the study, emissions from natural systems could increase the rise in global average temperatures by up to 0.6 degrees Celsius. This is in line with previous research suggesting that these emissions could shorten the time to exceed the 2-degree warming threshold by 25 percent. Brian Buma, a climate scientist at the Çevre Savunma Fonu, emphasizes that setting off without accounting for all emissions entering the atmosphere means losing from the very start. Experts state that the longer the correction of these calculations is delayed, the wider the gap between the targets and reality will become.

The largest sources of warming-triggered emissions are forest fires, wetlands, and permafrosts, and all three are undergoing rapid change recently. Global forest fire carbon emissions have increased by 60 percent alone since 2001. Factors such as the expansion of wetlands in Afrika and Asya, and the faster decay of plants in water due to rising temperatures, created a worrying leap in atmospheric methane concentration in 2020. While rising temperatures in the Kuzey Kutbu exacerbate fires in the Kuzey Kutbu, the melting of glaciers leads to the rapid decomposition of organic matter in the soil by microscopic organisms. The release of carbon dioxide and methane from all these regions also accumulates globally, creating a massive impact.

Record temperatures in recent years have severely affected the amount of carbon dioxide absorbed by all land ecosystems. The record heat experienced in 2023 and 2024 reduced the land carbon sink capacity, contributing to a record jump in atmospheric CO2 concentration. Although the land sink capacity seems to have recovered to its previous strength in 2025, tropical forests in Güneydoğu Asya and Güney Amerika have ceased to be carbon sinks and turned into carbon sources due to deforestation, fires, and increased decay. Experts also point out that the lack of sufficient data collected from remote regions stretching from the Congo Havzası to Sibirya makes these climate predictions difficult.