Feeding seaweed to cows could stop them from releasing toxic farts.
Cows should eat seaweed to save the planet
Boffins suggest that the planet could be saved if the animals eat the green underwater plant as it would cut methane emissions by 40 per cent with no effect on their health or weight.
The seaweed diet would also be straightforward for farmers to implement and could go some way to slashing the 14.5 per cent of global greenhouse gas emissions that livestock account for.
Professor Ermias Kebreab, senior author of the study at the University of California, Davis, said: "This method paves the way to make a seaweed supplement easily available to grazing animals.
"Ranchers could even introduce the seaweed through a lick block for their cattle.
"We need to make this seaweed additive or any feed additive more accessible to grazing cattle to make cattle farming more sustainable while meeting the global demand for meat."