‘People joke about burping cows without realizing how big the source really is,’ Stanford University scientist Rob Jackson says
Methane emissions have reached the highest levels on record across the globe, research finds.
Studies suggest that increases are being driven primarily by growth of emissions from coal mining, oil and natural gas production, cattle and sheep ranching and landfills.
The findings were outlined in two papers in Earth System Science Data, and Environmental Research Letters by researchers with the Global Carbon Project, an initiative led by Stanford University scientist Rob Jackson, published on Tuesday, according to a press statement.
Between 2000 and 2017, levels of the potent greenhouse gas barrelled up toward pathways that climate models suggest will lead to 3-4℃ of warming before the end of this century.
This is the temperature threshold at which scientists warn that natural disasters, including wildfires, droughts, and floods, and social disruptions such as famines and mass migrations become more likely.
In 2017, the latest when complete global methane data sets were available, Earth’s atmosphere absorbed nearly 600 million tons of the colourless, odourless gas that is 28 times more powerful than carbon dioxide at trapping heat over a 100-year span.
More than half of all methane emissions now come from human activities. Annual methane emissions are up 9%, or 50 million tons per year, from the early 2000s, when methane concentrations in the atmosphere were relatively stable.
In terms of warming potential, adding this much extra methane to the atmosphere since 2000 is equivalent to putting 350 million more cars on the world’s roads or doubling the total emissions of Germany or France.
“We still haven’t turned the corner on methane,” said Jackson, a professor of Earth system science in Stanford’s School of Earth, Energy, and Environmental Sciences.
Globally, fossil fuel sources and cows are twin engines powering methane’s upward climb. “Emissions from cattle and other ruminants are almost as large as those from the fossil fuel industry for methane,” Jackson said. “People joke about burping cows without realizing how big the source really is.”
Throughout the study period, agriculture accounted for roughly two-thirds of all methane emissions related to human activities; fossil fuels contributed most of the remaining third. However, those two sources have contributed in roughly equal measure to the increases seen since the early 2000s.
Methane emissions from agriculture rose to 227 million tons of methane in 2017, up nearly 11% from the 2000-2006 average. Methane from fossil fuel production and use reached 108 million tons in 2017, up nearly 15% from the earlier period.
Amid the coronavirus pandemic, carbon emissions plummeted as manufacturing and transportation ground to a halt. “There’s no chance that methane emissions dropped as much as carbon dioxide emissions because of the virus,” Jackson said. “We’re still heating our homes and buildings, and agriculture keeps growing.”
Methane emissions rose most sharply in Africa and the Middle East, China, and South Asia and Oceania, which includes Australia and many Pacific islands.
Each of these three regions increased emissions by an estimated 10 to 15 million tons per year during the study period.
The United States followed close behind, increasing methane emissions by 4.5 million tons, mostly due to more natural gas drilling, distribution and consumption.
“Natural gas use is rising quickly here in the US and globally,” Jackson said. “It’s offsetting coal in the electricity sector and reducing carbon dioxide emissions, but increasing methane emissions in that sector.”
The US and Canada are also producing more natural gas. “As a result, we’re emitting more methane from oil and gas wells and leaky pipelines,” said Jackson, who is also a senior fellow at Stanford’s Woods Institute for the Environment and Precourt Institute for Energy.
Europe stands out as the only region where methane emissions have decreased over the last two decades, in part by tamping down emissions from chemical manufacturing and growing food more efficiently.
“Policies and better management have reduced emissions from landfills, manure, and other sources here in Europe. People are also eating less beef and more poultry and fish,” said Marielle Saunois of the Université de Versailles Saint-Quentin in France, lead author of the paper in Earth System Science Data.
Tropical and temperate regions have seen the biggest jump in methane emissions. Boreal and polar systems have played a lesser role. Despite fears that melting in the Arctic may unlock a burst of methane from thawing permafrost, the researchers found no evidence for increasing methane emissions in the Arctic – at least through 2017.
Human driven emissions are in many ways easier to pin down than those from natural sources. “We have a surprisingly difficult time identifying where methane is emitted in the tropics and elsewhere because of daily to seasonal changes in how waterlogged soils are,” said Jackson, who also leads a group at Stanford working to map wetlands and waterlogged soils worldwide using satellites, flux towers and other tools.
According to Jackson and colleagues, curbing methane emissions will require reducing fossil fuel use and controlling fugitive emissions such as leaks from pipelines and wells, as well as changes to the way we feed cattle, grow rice and eat.
“We’ll need to eat less meat and reduce emissions associated with cattle and rice farming,” Jackson said, “and replace oil and natural gas in our cars and homes.”
Feed supplements such as algae may help to reduce methane burps from cows, and rice farming can transition away from permanent water-logging that maximizes methane production in low-oxygen environments.
Aircraft, drones, and satellites show promise for monitoring methane from oil and gas wells. Jackson said: “I’m optimistic that, in the next five years, we’ll make real progress in that area.”