The unsung hero of climate action: Why it’s time to focus on superpollutants

For years, climate action has centered on one greenhouse gas: carbon dioxide (CO₂). Rightly so. CO₂ accounts for the vast majority of global greenhouse gas emissions and remains essential to address if the world is to reach its climate goals.

But focusing on CO₂ alone tells only part of the story​​.

There are several greenhouse gases and particles, recently described as “superpollutants,” that are responsible for more than half of the warming we experience today, despite making up only a small fraction of total emissions. They are often short-lived but extremely potent, so reducing them offers one of the fastest opportunities to slow global warming.

Understanding what drives global warming

The Earth's climate is shaped by three primary factors:

• The amount of energy the planet receives from the sun.
• How much of that energy is reflected back into space.
• The concentration of greenhouse gases in the atmosphere.

While the first two factors remain relatively stable, greenhouse gas concentrations have changed dramatically over the past two centuries because of human activity. These gases trap heat that would otherwise escape into space, warming the planet.

CO₂ receives most of the attention because we emit enormous quantities of it. But not all greenhouse gases are equally powerful.

What makes a pollutant "super"?

Superpollutants are greenhouse gases or, in some cases, particles that trap far more heat than carbon dioxide on a molecule-for-molecule basis.

Methane is perhaps the best-known example. Over a 100-year period, methane has roughly 30 times the warming impact of CO₂. But that long-term comparison actually understates its influence. During its first 20 years in the atmosphere, methane can be 80 to 100 times more powerful than carbon dioxide.

Methane isn't the only superpollutant. Others include:

• Refrigerants such as hydrofluorocarbons (HFCs) and chlorofluorocarbons (CFCs), some of which are hundreds or even thousands of times more potent than CO₂.
• Nitrous oxide, a long-lived greenhouse gas with nearly 300 times the warming potential of carbon dioxide.
• Black carbon, a particle that remains in the atmosphere for only days or weeks but absorbs sunlight extremely efficiently, rapidly heating the atmosphere.

Each pollutant differs in how long it remains in the atmosphere and how much heat it traps. Understanding both factors is essential to understanding their climate impact.

Small emissions, outsized warming

The overall impact of a greenhouse gas depends on three things:

• How powerful it is at trapping heat.
• How long it remains in the atmosphere.
• How much of it humans emit.

Carbon dioxide dominates total emissions because we release so much of it. But superpollutants punch far above their weight.

Although they represent only about 3% of global greenhouse gas emissions by mass, superpollutants contribute more than half of today's warming.

This imbalance highlights why they deserve far greater attention within climate policy and carbon markets.

Where should action focus first?

Not all superpollutants contribute equally.

Methane is responsible for the largest share of warming among superpollutants, making it one of the highest-impact opportunities for immediate climate action.

Other significant contributors include refrigerants, nitrous oxide, volatile organic compounds (through indirect warming effects) and black carbon.

Looking across sectors, some of the largest opportunities for emissions reductions include:

• Agriculture
• Oil and gas
• Industry and manufacturing
• Mining
• Waste management

Each sector contributes different types of superpollutants, meaning solutions must be tailored to specific emission sources.

Why reducing superpollutants delivers faster climate benefits

One of the most compelling reasons to address superpollutants is speed.

Unlike carbon dioxide, which can remain in the atmosphere for centuries, many superpollutants disappear much more quickly. Methane, for example, has an atmospheric lifetime of roughly 12 years.

That means if methane emissions are significantly reduced today, this could produce measurable cooling within years, not generations.

This makes superpollutant mitigation one of the fastest ways to slow near-term warming while the world continues the longer transition away from fossil fuels.

Buying time to avoid climate tipping points

The world has already warmed by more than 1°C compared with pre-industrial temperatures.

Scientists warn that further warming increases the risk of crossing critical climate tipping points, which are thresholds beyond which natural systems may undergo irreversible change.

These include:

• Accelerated melting of the Greenland Ice Sheet
• Widespread coral reef collapse
• Thawing permafrost that releases additional greenhouse gases
• Large-scale changes in boreal forests

Because reductions in superpollutants can deliver climate benefits within a decade, they offer a unique opportunity to slow warming during this critical window and help reduce the likelihood of triggering these tipping points.

A necessary complement to CO₂ reductions

The growing focus on superpollutants is not about replacing carbon dioxide mitigation. Both are essential.

Reducing CO₂ remains fundamental to achieving long-term climate stability. But without also addressing superpollutants, limiting global warming to internationally agreed targets becomes significantly more difficult.

As awareness grows across climate science, policy and carbon markets, superpollutants are increasingly being recognized as one of the most impactful and often overlooked, opportunities for accelerating climate action.

Addressing these emissions offers something increasingly rare in climate policy: the chance to deliver meaningful climate benefits within years rather than decades. That makes superpollutants not just another category of greenhouse gases, but one of the most important levers available for slowing global warming today.