McDonald’s has long faced criticism over its environmental record: from excess packaging to allegations that its beef is grown on ex-rainforest land in Latin America. But now, the company is hitting back.

In the UK, McDonald’s has announced that the company is to convert all its delivery vehicles to run on biodiesel, using the firm’s supply of cooking oil. By using the fuel – made by combining cooking oil and rapeseed oil – the firm said it would save more than 1,650 tonnes of carbon every year.

The firm said it was “delighted” to be putting its large stock of cooking oil to a “practical, efficient use” within its own business. “This is a great example of how businesses can work together to help the environment,” said its senior vice president Matthew Howe.