Energy efficient buildings are an important part of tackling the world’s energy crisis. But while these structures can keep drafts out, they also have a hidden threat lurking within. Deep within their crevices and corners, green buildings are susceptible to trapping humid air in which toxic mold can spread. The problem, according to the Health and Safety Executive (HSE), affects between 30 and 50 percent of new or refurbished buildings. A number of these homes have become ghost buildings after the damp seeped in and destroyed furniture and belongings. …