The Association of Manufacturers of environmentally friendly carpets (GuT) has spent several years researching this subject matter. Findings from the RECAM project (Sustainable Closed Loop System for the Recycling of Carpet Materials) and the pilot factory CRE (Carpet Recycling Europe) have shown that carpets made from polypropylene and polyamide, the most common carpet materials, use enormous amounts of resources in the recycling process. Furthermore, the collection and consolidation of used carpets uses large amounts of energy as well. Elaborate and full spectrum research further showed, that the recycling of textile floorings, has a 12% worse energy balance, than using them as a "secondary fuel option" in replacing fossil fuels in industrial environments. To use textile floorings as an energy source for industrial processes, rather than recycling them, has so far been proven to be the most environmentally friendly disposal solution.