Sea superfood: Can seaweed help solve Ireland's cow methane problem?

Sea superfood: Can seaweed help solve Ireland's cow methane problem?

Advertisement

Scientists are combing Ireland's west coast for seaweed to feed to cattle and sheep after research showed it could stop them breathing out so much climate-warming methane.

The project, coordinated by a state agriculture body, is tapping into the country's growing seaweed harvesting industry, which is seeking new markets as it revives centuries-old traditions.

But some are sceptical that the seaweed feed additives - or any quick technological fix - can sidestep the need to reverse a surge in Irish cattle numbers if the country is to reduce Europe's largest per capita methane output by 2030.

. Inis Mor, Ireland. Reuters/Clodagh Kilcoyne
Seaweed harvester Marc O'Goill, who works for Blath na Mara seaweed company hauls a net of Serrated Rack (Fucus Serratus) seaweed across a rocky shore on the Aran Island.

Around 20 species of seaweed, most from Ireland's windswept Atlantic coast, have been tested by researchers while dozens more have been collected by the project's partners in Norway, Canada, Sweden, Germany and the United Kingdom.

Scientists in the United States and Australia have already demonstrated dramatic methane-reducing qualities from one seaweed type - Asparagopsis - when small quantities are added to feedstock.

But they have struggled to scale up production of the seaweed and to curb harmful side effects.

. Kilkeiran, Ireland. Reuters/Clodagh Kilcoyne
A traditional currach boat sits on the shore beside bundles of seaweed in the Connemara region of Kilkieran.

The Irish project aims to find abundant native seaweeds to use instead, even though the researchers admit they are unlikely to match the reduction in emissions of over 80% shown with Asparagopsis.

"We have identified some brown seaweeds that are very positive and they're producing results," said Maria Hayes, coordinator of the SeaSolutions project, whose team has achieved methane reductions of between 11% and 20% in early trials.

"The reductions aren't going to be a silver bullet ... but it can significantly reduce emissions," said Hayes, who works for Teagasc, Ireland's Agriculture and Food Development Authority.

. Hillsborough, Ireland. Reuters/Clodagh Kilcoyne
Dairy cattle gather around the solar powered methane measuring machine at the AFBI (Agri-Food and Biosciences Institute) research farm in Hillsborough.

Researchers are also working on how to integrate the feed additives into Ireland's predominantly grass-based cattle farming system.

On a farm outside Hillsborough, southwest of Belfast, researchers use treats to coax cows to poke their heads into a solar-powered machine that measures the level of methane on their breath.

. Hillsborough, Ireland. Reuters/Clodagh Kilcoyne
Dr Steven Morrison, Programme Leader in Sustainable Livestock Production at AFBI (Agri-Food and Biosciences Institute) in Northern Ireland, and Sharon Huws pose for a photograph in front of dairy cattle at the AFBI (Agri-Food and Biosciences Institute) research farm.

They will test them again using seaweed additives, said Sharon Huws, Professor of Animal Science and Microbiology at Queen's University Belfast.

"The levels that are used to feed ruminants are very, very small so you don't need to get a lot of it in order to get an impact," she said.

. Athenry, Ireland. Reuters/Clodagh Kilcoyne
Sheep are herded at the Teagasc Agriculture and Food Development Authority at the Mellows Campus in Athenry.

POLITICAL PRESSURE

The technology has caught the imagination of farming groups and politicians, who insist that stringent targets for cutting greenhouse gases like methane should not mean a reduction in the size of the Irish farming sector.

After growth of over 10% in the past 10 years, Ireland has 7.4 million cattle and is one of the largest exporters of beef and dairy in Europe.

Its per capita output of methane - which has a higher heat-trapping potential than CO2 - is by far the highest in the European Union, according to the Climate Watch database.

. Athenry, Ireland. Reuters/Clodagh Kilcoyne
A sheep looks out from a portable accumulation chamber where Emily Roskam, a PhD Walsh Scholar at Teagasc, measures the methane emissions of the sheep, after it spends an hour in the methane measuring chamber at the end of a Seasolutions trial.

The colourless and odourless gas leaks from waste dumps, oil and gas infrastructure and the digestive systems of cattle and sheep.

At the COP26 U.N. Climate Change conference in Glasgow this month, Ireland signed up to a pledge to cut global output of methane by 30% by 2030 from 2020 levels.

But government ministers insist that will mostly be achieved through a 50% cut in non-agricultural methane, with a reduction of just 10% in agricultural methane by 2030.

. Athenry, Ireland. Reuters/Clodagh Kilcoyne
"We have 140 sheep here and each morning they are getting half a kilo of concentrates, they get 400 grams of nuts made of maize meal and a bit of molasses which is kind of sugary to stick them together, then they each get 100grams of their additives, we have a 'control diet' or we have seaweed extract," said Roskam.

They point to seaweed feed additives as a way to curb emissions without downsizing the herd - with a reduction in the average age of slaughter of beef cattle and genetics research as other possible solutions.

Chemicals company Royal DSM says a rival food additive it produces can cut methane output by around 30%. The company said it had received regulatory approval in Brazil and Chile and is seeking approval in the European Union.

. County Donegal, Ireland. Reuters/Clodagh Kilcoyne
Rain falls over the Donegal coastline near County Donegal.

But not everyone is convinced the technology can meet the target.

"Scaling up these solutions takes time. We don't have time," said Sadhbh O'Neill, lecturer in climate policy and environmental politics at Dublin City University, a vocal critic of industry attempts to rely on technology rather than address the sustainability Ireland's agriculture model.

. Quilty, Ireland. Reuters/Clodagh Kilcoyne
"Sustainably harvesting means that we get crop regeneration. Seaweed has been harvested in this area for hundreds of years, once sustainably harvested in the same way as our ancestors have done, it will continue to regenerate," said Evan Talty.

SCALING UP

The Irish researchers have tapped into a network of seaweed harvesters who are reviving a tradition mentioned in monastic writings as far back as the 5th century.

But they do not yet have a plan to scale up production if tests are successful.

Some harvesters, who serve organic food and cosmetic markets, doubt the feed additives will be sufficiently lucrative with plenty of opportunities elsewhere.

"It's a huge market at the moment, seaweed is really thriving," said Evan Talty, managing director at Wild Irish Seaweed, who has revived harvesting techniques used by his grandfather and focuses on food and skin care products. The methane additive market is "not on our radar", he said.

. Inis Mor, Ireland. Reuters/Clodagh Kilcoyne
David O'Halloran picks up a pot of seaweed pesto which he has made with Jenny O'Halloran, as part of a line of products that their seaweed sells using seaweed that they have harvested, as he makes lunch for his family.

Others are more hopeful.

"Everyone keeps an eye on it," said Jenny O'Halloran of Bláth na Mara, a small-scale hand harvester on Inis Mór island off Ireland's west coast.

"Maybe the future of that is actually farming seaweed, which I think has to be part of the conversation when it comes to the future of seaweed in Ireland," she said.

Photo editing Gabrielle Fonseca Johnson; Text editing Giles Elgood; Layout Julia Dalrymple

1 / 9

Slideshow

People paddle at sea on a stand up paddle board in Galway bay with a view of the Burren karst landscape, seen from Galway.
. Galway, Ireland. Reuters/Clodagh Kilcoyne

People paddle at sea on a stand up paddle board in Galway bay with a view of the Burren karst landscape, seen from Galway.

Coleman Dundass, a seaweed harvester, ties up three 'climin', each of which are a two-tonne seaweed bundle that he gathered, as he stands in his currach boat in Kilkieran.
. Kilkeiran, Ireland. Reuters/Clodagh Kilcoyne

Coleman Dundass, a seaweed harvester, ties up three 'climin', each of which are a two-tonne seaweed bundle that he gathered, as he stands in his currach boat in Kilkieran.

O'Halloran works with seaweed harvester Marc O'Goill to take down fully dried Kombu (laminaria digitata) which hangs in the drying room on the O'Halloran's seaweed farm.
. Inis Mor, Ireland. Reuters/Clodagh Kilcoyne

O'Halloran works with seaweed harvester Marc O'Goill to take down fully dried Kombu (laminaria digitata) which hangs in the drying room on the O'Halloran's seaweed farm.

Sea Spaghetti seaweed (Himanthalia elongata) rests on top of Sea Lettuce (Ulva) while the tide is out, before it is harvested by the O'Halloran's of Blath na Mara seaweed company.
. Inis Mor, Ireland. Reuters/Clodagh Kilcoyne

Sea Spaghetti seaweed (Himanthalia elongata) rests on top of Sea Lettuce (Ulva) while the tide is out, before it is harvested by the O'Halloran's of Blath na Mara seaweed company.

Sinead O'Brien, the founder of Mungo Murphy's Seaweed Company, holds up a piece of kelp taken from a tank where abalone feed on it at her integrated multitrophic aquaculture farm where she grows abalone for export at her boutique business in Baile na hAbhann. "It's really important to have that sustainable cyclical relationship with the seaweed that's growing out there and using that natural feed for animals," said O'Brien.
. Baile Na Habhann, Ireland. Reuters/Clodagh Kilcoyne

Sinead O'Brien, the founder of Mungo Murphy's Seaweed Company, holds up a piece of kelp taken from a tank where abalone feed on it at her integrated multitrophic aquaculture farm where she grows abalone for export at her boutique business in Baile na hAbhann. "It's really important to have that sustainable cyclical relationship with the seaweed that's growing out there and using that natural feed for animals," said O'Brien.

Roskam and Sarah Woodmartin, both PhD Walsh Scholars at Teagasc, shepherd sheep out of a holding pen towards the methane measuring chambers towards the end of a Seasolutions trial.
. Athenry, Ireland. Reuters/Clodagh Kilcoyne

Roskam and Sarah Woodmartin, both PhD Walsh Scholars at Teagasc, shepherd sheep out of a holding pen towards the methane measuring chambers towards the end of a Seasolutions trial.

Roskam takes measurements on top of methane chambers .
. Athenry, Ireland. Reuters/Clodagh Kilcoyne

Roskam takes measurements on top of methane chambers .

Sheep are brought in for a new trial at the Teagasc Agriculture and Food Development Authority Mellows Campus.
. Athenry, Ireland. Reuters/Clodagh Kilcoyne

Sheep are brought in for a new trial at the Teagasc Agriculture and Food Development Authority Mellows Campus.

Cody Talty, 6, the nephew of Evan Talty attempts to drive his electric truck through the doorway of the packing room at the Wild Irish Seaweeds farm in Quilty.
. Quilty, Ireland. Reuters/Clodagh Kilcoyne

Cody Talty, 6, the nephew of Evan Talty attempts to drive his electric truck through the doorway of the packing room at the Wild Irish Seaweeds farm in Quilty.