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.
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