One of agriculture’s biggest climate problems begins inside the cow.
Cattle and other ruminant livestock produce methane through digestion, a process known as enteric fermentation. According to the IPCC AR6 Technical Summary, enteric fermentation accounts for 5 percent of global emissions, placing livestock methane among the more material and difficult emissions sources in the food system.
The challenge is that farmers have had few practical tools to reduce it at scale. Beef and dairy producers are being asked to cut emissions, satisfy tightening Scope 3 emissions expectations from processors and retailers, and maintain productivity at the same time.
That is why Asparagopsis matters.
Livestock methane is a climate problem without many farm-ready solutions
Agriculture cannot decarbonise in the same way as electricity or transport. A grid can replace coal with renewables. A vehicle fleet can shift to electric engines. Livestock methane is harder because it is biological, continuous, and tied directly to food production.
That has made it difficult for producers to respond to rising pressure from supply chains.
Processors, retailers, and export markets are scrutinising the carbon intensity of beef and dairy more closely, while farmers are still expected to increase output and protect margins. Consumers are also becoming more aware of the climate footprint attached to food, even if they rarely see the farm-level constraints behind it.
This is the adoption gap: the pressure to reduce emissions is already here, while the number of practical tools available to farmers remains limited.
Asparagopsis works because it fits into existing feeding systems
The commercial strength of Asparagopsis is that it does not require farmers to redesign how cattle are fed.
According to CSIRO, the native red seaweed can reduce methane emissions from cattle by over 80 percent, with an effective dosage of just 63 grams per cow per day mixed into standard total mixed rations at feedlots and dairy feed pads. That means it can be introduced through existing feeding systems without requiring new equipment or a radical redesign of farm operations.
The case becomes stronger when performance is considered alongside emissions. The same supplement has also been shown to improve feed conversion efficiency by 7 percent, which matters because agricultural climate solutions are far more likely to scale when they support productivity as well as sustainability.
That makes the opportunity relevant beyond climate teams. It should matter to producers, processors, retailers, exporters, and investors looking for lower-carbon supply chains that still make commercial sense.
Ocean farming is the missing link in commercialisation
The science around Asparagopsis has been compelling for years. The harder problem has been producing enough of it, reliably to support commercial adoption.
This is the problem Fremantle Seaweed was created to solve. The Western Australian company grows Asparagopsis through ocean-based aquaculture, using marine leases off the state’s coast to build a scalable supply pathway for cattle feed supplements.
In 2024, Fremantle Seaweed became the first company in Australia to successfully grow Asparagopsis on an ocean farm from spore material induced in a hatchery. This is a critical milestone as commercial adoption depends on supply certainty, not scientific promise alone.
The company already holds a 32-hectare marine aquaculture lease in Cockburn Sound, Derbal Nara, capable of producing 96 tonnes of dried Asparagopsis annually. That is enough to treat 4,175 cows every day for a full year.
Western Australia gives the model a further advantage. With over 10,000 kilometres of coastline across tropical to temperate zones, the state offers conditions that can support year-round cultivation and long-term production scale.
The climate maths deserves more attention
The potential impact becomes clearer at scale.
At full scale across 3,000 hectares, Fremantle Seaweed estimates its approach could abate nearly 900,000 tonnes of CO2 equivalent each year. To put that in perspective, this single commercial farm could offset more emissions annually than over 200 wind turbines.
Those figures should put seaweed-based methane reduction much closer to the centre of the agricultural decarbonisation conversation.
The global market opportunity is also significant, with Fremantle Seaweed estimating a $37.44 billion total addressable global market. That number reflects the size of the problem as much as the size of the business opportunity: livestock methane is global, persistent and increasingly exposed to commercial pressure.
The next test is adoption at commercial scale
Agriculture does not change because a solution looks elegant on paper. It changes when producers can see reliable supply, practical integration and credible trial data.
That is why Fremantle Seaweed is preparing a 400-day Wagyu feedlot trial involving 60 head of cattle and over 1,500 kilograms of dried Asparagopsis. The purpose is to generate the kind of evidence producers, processors and supply-chain partners need before adoption can move from promising to mainstream.
This is the real question for the industry: if a daily feed supplement can materially reduce livestock methane, improve feed efficiency and fit into existing feeding systems, how quickly can supply chains move to support it?
Seaweed should be part of the lower-carbon beef conversation
Asparagopsis is not a silver bullet for livestock emissions, but it is one of the few solutions already showing the potential to materially reduce methane while supporting farm performance and fitting within existing production systems.
The livestock sector does not have the luxury of waiting for perfect solutions. Methane is already under scrutiny from regulators, investors, processors and export markets. The pressure on producers will only intensify as Scope 3 reporting expectations become more embedded across global food supply chains.
Australia has an opportunity to lead here. The country already has world-class livestock industries, strong marine science capability and access to vast coastlines suitable for ocean-based aquaculture. What matters now is whether the industry is prepared to champion farmers with practical solutions that reduce methane without making farming harder or less productive.
