Business Green: The emerging European market for green consumer goods is set to double in value to EUR114bn (£95bn) during the next five years as the price premium on sustainable products begins to fall. That is the conclusion of a new study commissioned by the Centre for Retail Research on behalf of online comparison site Kelkoo.co.uk, which found that while sales of green goods currently account for just 2.5 per cent of the entire European retail market, the sector is set to expand …