U.S. oil and gas methane emissions remained essentially flat from 2019- 2024 even as production rose, according to a Johns Hopkins University study led by Ao Chen (PhD student) and Scot Miller (associate professor of environmental health and engineering), published in Communications Earth & Environment.
The researchers used satellite observations from TROPOMI and GOSAT combined with atmospheric inverse modeling to estimate emissions across the contiguous U.S. Total oil and gas methane emissions stayed in a narrow range of about 9.3-10.4 teragrams (Tg) per year. They fell by 0.58 Tg from 2019- 2023 but rose slightly from 2023- 2024. Emissions intensity (methane released relative to oil and gas production) dropped by roughly 11%, continuing a longer- term downward trend rather than reflecting a sharp new policy- driven decline.
Key points from the study and related coverage:
- Good news and bad news framing: Emissions did not surge despite major growth in production (especially after the hydraulic fracturing boom), contrary to some earlier fears. However, oil and gas remain a large share of U.S. methane emissions, and the data show no clear detectable drop attributable to recent federal measures such as the Inflation Reduction Act’s methane fees and Waste Emissions Charge or EPA Clean Air Act rules. Researchers note the counterfactual is unknown; emissions might have been higher without the policies.
- Drivers of stable absolute emissions and falling intensity: Improved infrastructure (more pipelines to capture and sell gas instead of flaring and venting it, especially in places like the Permian Basin), better industry practices and leak detection and repair, earlier regulations (e.g., New Source Performance Standards for newer facilities), and the rising economic value of natural gas as a commodity. Most of the intensity decline occurred around 2020- 2022.
- Regional variation: Texas saw a roughly 14% decline in oil and gas methane emissions. California and Colorado appear to be falling short of their own reduction goals. States with statutory targets sometimes have better inventory alignment with satellite data, but this did not clearly translate into faster emission reductions than states without such targets.
- Context on policy and inventories: Implementation of the IRA fee and related rules faced delays and was limited during the study window. Satellite- based estimates remain higher than EPA Greenhouse Gas Inventory figures (consistent with prior top-down studies), though they capture a similar intensity trend.
Methane is a potent short- lived greenhouse gas (roughly 30 times more powerful than CO₂ over short timescales), so absolute reductions matter for near- term climate impact.
The authors emphasize that while falling intensity is positive, sustained cuts in total emissions are still needed, and long- term regulatory consistency could influence future industry incentives.
The original Johns Hopkins Hub article (by Hannah Robbins, published October 13, 2026) is available at hub.jhu.edu. The peer- reviewed paper is in Communications Earth & Environment (DOI related to 10.1038/s43247-026-04039-0).
TROPOMI and GOSAT provide key satellite observations of atmospheric methane (CH₄) used in the Johns Hopkins study and many other emissions analyses.
In that research, scientists combined data from these instruments with atmospheric modeling. Because methane disperses with wind, they applied inverse modeling (an algorithm that works backward from observed atmospheric concentrations) to estimate where and how much methane was emitted from oil and gas sources on the ground across the contiguous U.S. for 2019- 2024.
TROPOMI (TROPOspheric Monitoring Instrument)
- Platform: Onboard the European Space Agency’s (ESA) Sentinel- 5 Precursor satellite, launched in October 2017.
- Capabilities: A push- broom imaging spectrometer that measures reflected sunlight across ultraviolet, visible, near-infrared, and shortwave infrared (SWIR) bands. Methane is retrieved primarily from the SWIR band around 2.3 μm.
- Coverage and resolution: Daily near- global coverage with a wide ~2,600 km swath. Nadir pixel size is about 7 × 7 km (improved to ~5.5 × 7 km after August 2019).
- Strengths: High spatial resolution and dense sampling enable mapping of both regional patterns and some larger point sources. It produces column- averaged dry- air mole fractions of methane (XCH₄).
- Limitations: Strict quality filtering yields a relatively low retrieval success rate (~3% in some analyses) due to clouds, aerosols, and surface conditions. It can show larger regional biases (especially over low- albedo surfaces) compared with more mature instruments. Reported precision is around 0.6%.
GOSAT (Greenhouse gases Observing SATellite)
- Platform: Japan’s GOSAT series (first satellite, nicknamed “IBUKI”, launched in 2009; successor GOSAT- 2 launched in 2018). Operated by JAXA with involvement from Japan’s Ministry of the Environment and National Institute for Environmental Studies.
- Capabilities: Dedicated greenhouse- gas mission using Fourier- transform spectrometers (TANSO-FTS / TANSO- FTS-2) to measure CO₂ and CH₄ columns via solar backscatter in the SWIR.
- Coverage and resolution: Sparser sampling, circular pixels of ~10.5 km diameter, typically spaced hundreds of kilometers apart, with a multi- day revisit cycle (e.g., ~3 days in standard mode for the original GOSAT). Higher retrieval success rate (~24%, limited mainly by clouds) than TROPOMI.
- Strengths: More mature retrievals with generally lower biases. Often used as a reference or for bias correction of denser datasets like TROPOMI. Precision is typically reported around 0.7%. It has provided a long- term record of global methane trends since 2009.
- Limitations: Much lower data density (roughly 100- 250 times fewer observations than TROPOMI in comparable periods), which limits fine- scale mapping.
How they are used together
TROPOMI supplies dense, high- resolution coverage, while GOSAT offers higher- accuracy, lower- bias measurements. Many studies (including the Johns Hopkins work) blend or jointly assimilate the two datasets. Machine- learning approaches are sometimes applied to correct TROPOMI biases relative to GOSAT (e.g., adjusting for aerosols, surface albedo, or viewing geometry). Validation against ground-based networks such as TCCON typically shows small global mean biases for both (often a few ppb), though regional differences can exceed 10- 20 ppb in challenging conditions.
These satellite XCH₄ observations enable independent, top- down estimates of emissions that complement bottom- up inventories (such as the EPA’s Greenhouse Gas Inventory). In the Johns Hopkins analysis, the combined data supported the conclusion that U.S. oil and gas methane emissions stayed relatively flat (~9.3- 10.4 Tg/year) while intensity declined ~11% amid rising production.
U.S. oil and gas methane emission intensity declined 2019–2024 with little indication of federal policy impact
U.S. oil and gas methane emissions remained essentially flat from 2019 to 2024 even as production increased, according to a Johns Hopkins University study.
The research, led by PhD student Ao Chen and senior researcher Scot Miller (associate professor of environmental health and engineering), was published in Communications Earth & Environment. It is covered in a Johns Hopkins Hub article by Hannah Robbins (published October 13, 2026).
Key findings
Researchers combined satellite data from TROPOMI and GOSAT with atmospheric inverse modeling to estimate emissions across the contiguous United States.
- Total methane emissions from oil and gas activities stayed between roughly 9.3 and 10.4 teragrams (Tg) per year.
- Emissions declined by 0.58 Tg from 2019- 2023, then rose slightly from 2023- 2024.
- Emissions intensity (methane released relative to oil and gas production) fell by about 11%. This continues a longer-term downward trend rather than reflecting a sharp drop driven by recent policy.
Miller described it as a “good news/bad news situation”: emissions did not surge as some had feared amid major production growth (especially after the hydraulic fracturing boom), but oil and gas still account for a large share of U.S. methane emissions, and the study found no clear detectable reduction attributable to recent federal measures such as the Inflation Reduction Act’s methane- related provisions or related EPA rules. The authors note it is impossible to test the counterfactual; emissions might have been higher without those policies.
Why emissions stayed flat while production rose
Contributing factors include expanded pipeline infrastructure (allowing more gas to be captured and sold instead of flared or vented, particularly in areas like the Permian Basin), improved industry practices and leak detection, earlier regulations on newer facilities, and the rising economic value of natural gas as a commodity. Better protocols and reduced flaring have helped lower intensity even as overall output grew.
Regional notes
Texas (home to the largest oil- producing basin) saw an approximately 14% decline in oil and gas methane emissions. California and Colorado appear to be falling short of their own reduction goals.
Methane is a potent, shorter- lived greenhouse gas (roughly 30 times more powerful than CO₂ over short timescales). The authors stress that while falling intensity is positive, meaningful climate impact requires reductions in absolute emissions, and longer-term regulatory consistency may be needed to further incentivize cuts.
The original Hub article is available at hub.jhu.edu.
Journal: Communications Earth & Environment 7, Article number: 813 (2026)
DOI: 10.1038/s43247-026-04039-0 peer- reviewed
Provided: Johns Hopkins University
Authors: Ao Chen,
William S. Daniels,
Ziting Huang,
Arvind P. Ravikumar,
Sarah M. Jordaan,
Zhen Zhang,
Leyang Feng,
Hanyu Liu,
Lee T. Murray,
Xueying Yu,
Dylan C. Gaeta,
Kristan L. Morgan,
Jialuo Yuan &
Scot M. Miller
Abstract
The U.S. federal government undertook a historic legislative effort to regulate methane emissions from the oil and gas sectors beginning in 2021 through the Inflation Reduction Act and Waste Emissions Charge. Despite a substantial rollback of these regulations in subsequent years, U.S. oil and gas methane emissions during this policy window are largely uncharacterized. Here we estimate changes in U.S. methane emissions both before and directly after this policy window (years 2019 to 2024) using an inverse model constrained by satellite observations. Overall, we find that oil and gas methane emissions decreased by 0.58 [0.30, 0.96] Tg from 2019 to 2023, but increased by 0.21 [-0.06, 0.53] Tg in the years following the new federal policy (2023–2024). We find that methane emissions intensity declined by 11.1% [9.3%, 13.6%] from 2019 to 2024, likely as a result of gradual technological and operational developments, and existing federal regulations.
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