Tesco has joined with British government-backed agency the Carbon Trust to measure the carbon footprint of products it stocks.
Thirty products sold by the country's biggest retailer will be assessed in five categories - tomatoes, potatoes, orange juice, light bulbs and washing detergent, a statement said.
"What we learn from this project will be invaluable to our efforts to help companies make informed decisions about what they produce and offer to consumers," Climate Change Minister Joan Ruddock said.
The Carbon Trust is a private company set up and funded by the British
government in response to the threat of climate change and to accelerate the country's transition to a low-carbon economy.
It has already worked with Walkers Crisps, health and beauty group Boots and drink maker Innocent on carbon footprinting and carbon labelling projects.