Estimates vary, but livestock are reckoned to be responsible for up to 14 percent of all greenhouse emissions from human activities, with the average cow producing 250-500 litres of methane a day.
AgResearch have been working on giving cows a vaccine against certain gut microbes that are responsible for producing methane.
The more fibre a cow eats, the more methane it produces, but adding legumes and various oils to their diet can be helpful.
However, now researchers at the University of California have found that a small amount of seaweed fed to cows over five months means they produce 82 percent less methane.
Nanogirl Michelle Dickinson joined Francesca Rudkin to explain.
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