Methane cuts on track for 2030 emissions goal

The world’s methane emissions have surged in the past two decades, but it’s a different story in Australia.

Livestock emit methane in their burps. Picture: Zoe Phillips

Australia’s methane emissions have decreased over the past two decades, according to a new report by a leading global carbon research group.

While the world’s methane emissions grew by 20 per cent, meaning two thirds of methane in the atmosphere is from human activity, Australasia and Europe emitted lower levels of the gas.

It puts Australia in relatively good stead, compared to 150 other signatories, to meet its non-binding commitments to the Global Methane Pledge, which aims to cut methane emissions by 30 per cent by the end of the decade.

The findings were revealed in the fourth global methane budget, published by the Global Carbon Project, with contributions from 66 research institutions around the world, including the CSIRO.

According to the report, agriculture contributed 40 per cent of global methane emissions from human activities, followed by the fossil fuel sector (34 per cent), solid waste and waste­water (19 per cent), and biomass and biofuel burning (7 per cent).

Pep Canadell, CSIRO executive director for the Global Carbon Project, said government policies and a smaller national sheep flock were the primary reasons for the lower methane emissions in Australasia.

“We have seen higher growth rates for methane over the past three years, from 2020 to 2022, with a record high in 2021. This increase means methane concentrations in the atmosphere are 2.6 times higher than pre-­industrial (1750) levels,” Dr Canadell said.

The primary source of methane emissions in the agriculture sector is from the breakdown of plant matter in the stomachs of sheep and cattle.

It has led to controversial calls from some circles for less red meat consumption, outraging the livestock industry, which has lowered its net greenhouse gas emissions by 78 per cent since 2005 and is funding research into methane reduction.

Last week, the government agency advising Anthony Albanese on climate change suggested Australians could eat less red meat to help reduce emissions. And the government’s official dietary guidelines will be amended to incorporate the impact of certain foods on climate change.

There is ongoing disagreement among scientists and policymakers about whether there should be a distinction between biogenic methane emitted by livestock, which already exists in a balanced cycle in plants and soil and the atmosphere, and methane emitted from sources stored deep underground for millennia.

“The frustration is that methane, despite its source, gets lumped into one bag,” Cattle Australia vice-president Adam Coffey said. “Enteric methane from livestock is categorically different to methane from coal-seam gas or mining-related fossil fuels that has been dug up from where it’s been stored for millennia and is new to the atmosphere.

“Why are we ignoring what modern climate science is telling us, which is these emissions are inherently different?”

Mr Coffey said the methane budget report showed the intense focus on the domestic industry’s environmental credent­ials was overhyped.

“I think it’s based mainly on ideology and activism,” Mr Coffey said.