Sainsbury's has introduced a traffic light system to benchmark greenhouse gas emissions at its individual Dairy Development Group farms.

Following audits carried out by White Gold, part of AB Agri, earlier in the year, SDDG farmers will receive information on the individual performance of their farm and how it ranks compared with the other members' farms.

"It shows where they are within the pool. Its benchmarking so they can improve their performance," said Sainsbury's agricultural manager Annie Graham.