Full implementation of methane plans would reverse emissions growth but still miss 2030 goal

A new scientific assessment finds that even if every government fully carries out the methane-reduction plans it has already put on paper, global methane emissions would fall by only about 11 percent between 2020 and 2030. That would be enough to reverse the gas's current upward trajectory, but it covers barely a third of the ground nations agreed to travel when they signed the Global Methane Pledge five years ago.

The study, led by researchers at the International Institute for Applied Systems Analysis (IIASA) in Austria with coauthors from the UN Environment Programme, was published this month in the journal Global Biogeochemical Cycles. It is a sector-by-sector, country-by-country accounting of how much methane the world could realistically cut by the end of the decade, and at what cost, built on the same bottom-up simulation framework IIASA has used for years to track oil, gas, coal, waste and farm emissions separately rather than relying only on top-down atmospheric estimates.

What the numbers show

The 159 countries and the European Commission that have joined the Global Methane Pledge committed to cutting global methane output at least 30 percent from 2020 levels by 2030. The new analysis finds that a 22 percent cut is achievable at relatively low cost using technology already on the market. Pushing further, to the full 30 percent, would consume nearly all of the technical mitigation potential available this decade — the authors describe it as still technically achievable, but only if governments are willing to pay for the most expensive remaining measures and not just the cheapest ones.

About 70 percent of the technical potential for cuts between now and 2030 sits in the fossil fuel sector, according to the researchers' breakdown:

• Reducing venting and flaring of associated gas during oil production
• Fixing leaks across oil and gas production, processing and transport infrastructure
• Capturing or limiting methane released during coal mining

The solid-waste sector offers the next-largest opportunity, chiefly by diverting organic waste away from landfills and capturing gas from dumps that are already closed but still decomposing. Agriculture is the hardest sector to abate: methane from enteric fermentation in cattle and other ruminants has comparatively little technical mitigation potential with current tools, the study finds, leaving livestock emissions largely untouched by the menu of near-term fixes available to the energy and waste sectors.

Why methane carries outsized weight

Methane breaks down in the atmosphere within roughly a decade, far faster than carbon dioxide, but it traps far more heat while it lasts. The study's authors estimate that methane is responsible for roughly 0.5 degrees Celsius of warming since preindustrial times — about a third of all observed warming to date — and that human activity accounts for roughly two-thirds of methane emissions overall, with agriculture, fossil fuels and waste as the three largest sources.

That backdrop is visible in the raw atmospheric record. NOAA's long-running monitoring network put the global monthly mean methane concentration at 1,934.6 parts per billion in June 2026, more than two and a half times its preindustrial level. The year-over-year rate of increase has eased somewhat — 2025's annual rise was about 4.8 parts per billion, down from a spike of nearly 18 parts per billion in 2021 — but concentrations are still climbing, not falling, which is precisely the trend the new study says full implementation of current pledges would finally arrest.

Who the gap affects

The shortfall lands most directly on the governments that signed the pledge at the COP26 summit in Glasgow in 2021 and have spent the years since translating it into national methane action plans. The study gives those governments a concrete yardstick: plans as currently written, if executed in full, get the world about a third of the way to the collective 2030 goal, not all the way.

It also points to specific industries. Oil and gas operators face the largest share of readily available cuts, meaning flaring and leak-detection rules already moving through the European Union, the United States and other jurisdictions carry most of the weight if the 22 percent "low-cost" tier is to be reached. Waste management agencies and landfill operators are the second-largest lever. Livestock producers and the broader agricultural sector, by contrast, are identified as having the least near-term room to maneuver, a finding that echoes previous assessments, including UNEP's Global Methane Status Report 2025, released at COP30 in Belém last November, which similarly found current national plans and action plans falling well short of the pledge's trajectory.

Beyond specific sectors, the study's authors frame the stakes in terms of near-term warming avoided: because methane acts so quickly and so powerfully, cuts made this decade have an outsized effect on how much warming the planet experiences by mid-century, compared with carbon dioxide reductions that take decades longer to show up in the temperature record.

What researchers are saying

Lena Höglund-Isaksson, the IIASA senior research scholar who led the study, framed the findings as a case for urgency rather than resignation.

"It is late, but not too late to achieve significant and meaningful reductions in methane emissions."

She and her coauthors argue that the economics favor acting now: their modeling finds that the cost of deploying methane mitigation technology across the fossil fuel, waste and agricultural sectors is considerably lower than the cost of letting the emissions continue and dealing with the resulting climate damage later. The authors also point to what they describe as a current window of political momentum, built on the Global Methane Pledge's five-year run and the steady, if incomplete, stream of national action plans submitted since Glasgow, as grounds for pressing governments toward the more ambitious end of their own commitments rather than settling for the cheaper, partial cuts.

What happens next

The dataset underlying the study's country- and sector-level projections has been posted publicly on Zenodo, giving governments and outside researchers a way to check the assumptions behind their own national plans against the same model IIASA used. The practical test now falls to the countries themselves: whether the oil and gas leak-repair rules, landfill gas capture programs and coal mine methane rules already on the books in dozens of countries are actually enforced and funded through 2030, rather than left as pledges on paper.

The Global Methane Pledge's steering committee and UNEP are expected to continue tracking country-level progress toward the 2030 benchmark in the run-up to the next UN climate conference, where methane is likely to remain a recurring agenda item given how far current trajectories sit from the collective target. For now, the new study's authors say the technical and financial case for closing more of the gap is already established; what remains open is whether governments choose to spend on it.