National Public Radio: Energy Stars are those blue stickers that are supposed to help you choose the most energy-efficient appliances, TVs and other power-hungry gadgets. More than one-third of Americans use them to pick products, according to the Environmental Protection Agency, which runs the program with the Energy Department. The government says Energy Star is working so well that last year it helped Americans save the same amount of greenhouse gas pollution as is produced by 29 million cars. But …