BBC: In the UK, consumer products increasingly bear labels that display the amount of carbon used to make, market, and distribute them. As the BBC’s Mark Kinver reports, the values, which are accredited by the Carbon Trust, were launched in 2007 and initially greeted with skepticism. However, carbon-labeled goods are selling at a rate of £2 billion ($3.2 billion) a year, which suggests that the labels are influencing consumers’ behavior.