Business Green: As sales challenges go it might well be up there with the proverbial selling ice to eskimos, but according to one of the world’s largest providers of building insulation, hot countries should be a major growth area for the sector over the coming decades – if only people can get over the perception that the technology is only of use in cold climates. “When you talk about insulation you immediately think cold outside, warm inside,” said Eelco van Heel, chief executive of Danish …