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Dairy farmers in the UK are trying out new ways of cutting the impact their work has on the climate, including trialling 'poo power' to fuel milk tankers.

They're also monitoring cow health by using Fitbit-like collars, according a new report.

It's been published by farmer-owned co-operative Arla and looks at the carbon footprint of milk using independently assessed data from 1,964 UK farms.

Arla hopes the report will help the co-operative meet its target for a 30% cut in emissions per kilogramme of milk at farm level by 2030. There is also the ambition to become carbon net zero across the supply chain by 2050.

Measures farmers can take, and are already taking, include reducing the amount of protein that cows eat as well as making sure they are healthy and happy.

The report says healthy, contented cows make milk production more efficient which in turn lowers emissions.

Farmers are using technology such as Fitbit-like collars or ankle bracelets, as well as sensors that pick up and analyse behaviour to check on welfare.

Another idea is using cow pats for energy - that's 'poo power' or bio-gas from slurry being used as a fuel for tankers.

Alice Swift, agriculture director for Arla Foods, said: "Dairy can and should be part of a sustainable diet and our new report is a major step forward in demonstrating just how much action is already under way across Arla farms as we move towards carbon net zero dairy production.

"All food production creates emissions, but our farmers are stepping up to help with the climate and environmental crisis we face."