Cows

Cows (or cattle as they are technically known) are one of the most well-recognised animals on the planet. These big bovines have been domesticated for centuries, and are useful for their milk (which makes such delights as cheese and yogurt), and meat (think beef burgers and steak). Another use for cows is their dung, which makes a surprisingly effective fuel. Despite their helpfulness, cattle farming is thought to contribute up to 20 per cent of global greenhouse gases, thanks to their own, hearty 'emissions' in the form of methane.

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