Declaring itself the leader of the Green Consumption movement, UK super-hyper-market chain Tesco said it will offer Green Choices labels on more than 70,000 products to inform consumers about the carbon cost.

"We will begin the search for a universally accepted and commonly understood measure of the carbon footprint of every product we sell."

The retailer said they will make the labels easily understandable and include the product's complete lifecycle: From production to distribution and consumption. Not an easy task: Timberland has also been giving a shot at eco-labeling:

"We found that our supply chain goes farther than we imagined," Jeffrey Swartz (CEO) said. "You have to go back to the cow" that supplied the leather.

The question is how far will Tesco go in measuring the carbon cost of its products? Will they also take into account indirect variables in carbon emission like the carbon cost induced by its consumers and suppliers?

Tesco is also helping create the Sustainable Consumption Institute that would develop a universal carbon measure thereby paving the way for other companies and sectors in providing product carbon counting.

While Wearefoodgeek gives Tesco an "A" for effort, consumers will now face SO many calculations - price, calories, sugar, fat, carbs and now carbon footprint - that the supermarket should offer remedial math classes!