Benugo has extended its carbon labelling scheme to 40 of its cafés and restaurants in the UK.
It comes after the catering company piloted carbon labelling through its partnership with the Natural History Museum this September.
The roll-out includes the V&A, British Museum, Science Museum, Barbican, Benugo cafés in John Lewis and Benugo high street branches.
Foodprint from Nutritics has developed and administered the carbon labelling system, which scores levels of carbon impact from A-E, with A being the most climate-friendly option.
Shane Kavanagh, commercial director at Benugo, said: "We want to give our customers the option of making informed choices to reduce the carbon emissions associated with food purchased from our sites across the UK.
"Using the Nutritics Foodprint solution enables us to use software we already successfully deploy for our nutritional calculations. It allows us to treat carbon in the same way we treat a nutritional value, applying it to every food and drink item for which we have a recipe, helping customers make more sustainable choices, and helping us develop lower carbon food choices across our business."
Stephen Nolan, managing director of Nutritics, added: "After a successful pilot in the NHM in London, we are thrilled to see our Foodprint environmental impact food labels rolling out across a further 40 Benugo sites. The climate crisis is the most important issue of our generation and demand for transparency of food information is increasing.
"We look forward to playing our part in nudging society towards a more sustainable food future."