For savvy shoppers, there's a raft of new reasons to look at labels: REI's ecoSensitive tag (right) ID's clothes made of materials like organic cotton, hemp, bamboo, or recycled synthetics. Stickers on all new U.S. vehicles now estimate the annual cost of fueling up. (In New York and California, they'll soon include information on greenhouse-gas emissions too.) U.K. manufacturers are adding carbon-footprint data to food ingredient lists, and a new California law will require the source of bottled water to be disclosed on the label.