Recent observations suggest that several key Earth system feedbacks are becoming increasingly important in shaping the trajectory of global warming. These include:
Natural systems that once absorbed large amounts of atmospheric carbon are increasingly showing signs of instability, with some regions transitioning from net carbon sinks to net carbon sources.
This shift reframes the central problem of climate change. The issue is no longer limited to direct human emissions alone. Instead, there is growing concern that Earth’s own internal feedback mechanisms may increasingly amplify warming independently of future fossil-fuel reductions.
These interacting processes can be understood as a “domino effect”, in which destabilization in one subsystem accelerates disruption in others. Together, they are driving a climate system that is becoming more nonlinear, more interconnected, and more difficult to predict using traditional linear assumptions.
While precise outcomes remain uncertain, a growing body of evidence suggests that reinforcing feedback loops are contributing to warming beyond what would be expected from direct human emissions alone.
The greatest uncertainty is no longer whether climate change will occur, but how strongly Earth’s own feedback systems will accelerate it as critical thresholds are crossed.
Q: Is there evidence climate feedbacks are starting to add CO₂ through wildfires, zombie fires, climate whiplash, brown carbon, forest dieback, and ozone-related productivity decline?
A: Yes. Robust and escalating scientific evidence confirms that climate feedback loops are actively weakening natural land sinks and increasing atmospheric CO₂.
Climate Feedback Loops Are Weakening Earth’s Natural Carbon Sinks
A growing body of scientific evidence indicates that climate feedback loops are actively weakening Earth’s natural land carbon sinks while simultaneously releasing additional greenhouse gases into the atmosphere. Recent global carbon assessments — including synthesis reports such as the 2025 Global Carbon Budget and 10 New Insights in Climate Science — suggest that natural land sinks have been approximately 15% weaker over the past decade due to intensifying climate impacts.
The consequences are already visible in atmospheric measurements. During recent years marked by extreme heat, drought, and wildfire activity, atmospheric concentrations increased at record rates even when fossil-fuel emissions grew relatively slowly. This divergence suggests that ecosystems previously capable of absorbing significant quantities of carbon are losing efficiency or, in some cases, reversing into net carbon sources.
For decades, forest fires were often treated as relatively carbon-neutral events because burned vegetation could eventually regrow and reabsorb much of the released carbon. Climate change is disrupting this balance.
A major study published in Science found that global emissions from forest fires increased by roughly 60% between 2001 and 2023. The most dramatic changes are occurring in boreal forests across Canada, Alaska, and Siberia, where warming temperatures are driving larger, hotter, and more destructive fires.
In these northern forests, wildfire emissions have nearly tripled in some regions. Canada’s recent record wildfire seasons alone released approximately 0.86 gigatons of carbon into the atmosphere, representing one of the largest fire-related carbon pulses ever observed.
Another growing concern involves so-called “zombie fires” — overwintering fires that continue smoldering underground long after surface flames disappear.
These fires occur primarily in peatlands and carbon-rich organic soils. Because peat accumulates slowly over thousands of years, it stores enormous quantities of ancient carbon. As Arctic regions warm at roughly twice to four-times the global average rate, these underground fires are increasingly penetrating deeper into thawing soils.
Research led by scientists at the University of California, Berkeley suggests that many climate models may significantly underestimate emissions from these northern fires. Once released, this ancient stored carbon re-enters the modern atmosphere, intensifying greenhouse warming.
“Climate whiplash” — rapid transitions between severe drought and intense rainfall — is also altering how ecosystems exchange carbon with the atmosphere.
Under stable conditions, plants absorb through photosynthesis while soils and microorganisms release carbon through respiration. Extreme heat and drought, however, can sharply increase microbial respiration while simultaneously suppressing plant productivity.
Recent monitoring data indicates that heterotrophic respiration — carbon released from soils and microbial activity — is increasingly outpacing photosynthetic carbon uptake during major climate anomalies.
This imbalance contributed to what researchers described as a major weakening of the global land carbon sink in 2024, particularly across tropical savannas and grasslands stressed by extreme heat and drought.
Wildfires also produce large quantities of brown carbon — light-absorbing organic aerosols that can intensify warming effects beyond direct carbon emissions alone.
When brown carbon settles on Arctic sea ice, glaciers, or snow-covered mountain ranges, it darkens the surface and reduces planetary albedo — Earth’s ability to reflect sunlight back into space.
Darker surfaces absorb more solar energy, accelerating local melting and increasing permafrost thaw. This, in turn, can release additional methane and ancient carbon dioxide trapped in frozen soils, creating another reinforcing feedback loop.
Rising temperatures and prolonged drought are triggering widespread forest mortality events across many regions of the world.
When forests exceed critical drought thresholds, trees can experience hydraulic failure — a breakdown in their ability to transport water internally. Entire forest regions may then undergo rapid dieback.
Dying forests become increasingly vulnerable to wildfire, fungal disease, and insect infestations such as bark beetle outbreaks. Instead of functioning as carbon sinks, these stressed ecosystems begin releasing stored carbon through decay, combustion, and decomposition.
Surface-level ozone , which forms more readily during heatwaves and stagnant atmospheric conditions, is also becoming a major threat to global plant productivity.
Unlike protective ozone high in the stratosphere, ground-level ozone acts as a powerful phytotoxin. Elevated ozone exposure damages plant tissues, interferes with stomatal function, and reduces photosynthetic efficiency.
As a result, climate-driven ozone spikes can suppress Gross Primary Productivity (GPP) — the total amount of carbon plants remove from the atmosphere through photosynthesis.
This means that climate change is not only increasing greenhouse gas emissions through fires, drought, and ecosystem collapse, but is simultaneously weakening the biological systems responsible for removing carbon from the atmosphere in the first place.
Also see: Ozone as a Climate Multiplier: Key Coupling Agent in Chemistry–Climate Feedbacks
Taken together, these feedback loops reveal a climate system becoming increasingly self-reinforcing. Wildfires, drought, ecosystem collapse, ozone pollution, thawing permafrost, and altered atmospheric circulation patterns are no longer isolated events. They are interacting components of a rapidly changing Earth system.
As natural carbon sinks weaken, a larger fraction of human emissions remains in the atmosphere, accelerating warming further and intensifying the very feedback loops driving the problem.
Multiple climate feedback mechanisms are now interacting in ways that can reinforce and accelerate one another. Rather than operating independently, these feedback loops increasingly behave as a coupled system — a “Domino Effect” of cascading, interacting stressors in which disruption in one component amplifies stress in others.
For example, rising temperatures intensify wildfires and particulate pollution, which in turn degrade air quality and suppress photosynthetic activity. Reduced plant carbon uptake can then contribute to higher atmospheric concentrations, further amplifying warming. In parallel, sea level rise and glacial mass loss increase coastal erosion, displacement, and infrastructure stress, which can reinforce socioeconomic and political feedbacks that slow or complicate mitigation and adaptation responses.
Taken together, these interacting processes reflect the behavior of a complex adaptive system under increasing strain. As feedbacks accumulate and intersect, the system’s response becomes more nonlinear and less predictable, requiring probabilistic rather than deterministic descriptions of future outcomes.
* Our probabilistic, ensemble-based climate model — which incorporates complex socio-economic and ecological feedback loops within a dynamic, nonlinear system — projects that global temperatures are becoming unsustainable this century. This far exceeds earlier estimates of a 4°C rise over the next thousand years, highlighting a dramatic acceleration in global warming. We are now entering a phase of compound, cascading collapse, where climate, ecological, and societal systems destabilize through interlinked, self-reinforcing feedback loops.
Tipping points and feedback loops drive the acceleration of climate change. When one tipping point is toppled and triggers others, the cascading collapse is known as the Domino Effect.