Christian Science Monitor: In Britain, carbon footprinting – used initially to broadly measure environmental impact across a company’s entire operations – is morphing into an eco-labeling tool. Earlier this year, the British supermarket chain Tesco began labeling some of its 70,000 products to reflect the carbon released in the their production, transport, and consumption. The 3,729 store behemoth, the world’s fourth-largest retailer, now has 20 carbon-labeled items on its shelves, core items such as orange …