Friesian cows may not seem like a natural predator for the Arctic polar bear, but ruminating cattle create a large amount of methane gas, contributing to the greenhouse effect that causes melting ice and loss of habitats for polar bears.
There are 1.4 billion cows worldwide and each produces approximately 300 grams of methane a day, or 14 per cent of all emissions of the gas, according to a study fromWageni ngen University in the Netherlands.
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