One of the dirtiest and most demonized portions of the municipal waste stream may soon be diverted from its centuries-long decomposition site: landfills. Developing a recycling solution for used disposable diapers, a biological amalgam of complexity, has been a top priority of the global research and development team at TerraCycle Inc., a Trenton, N.J.-based company whose mission is to create innovative solutions for any waste stream headed to the landfill. TerraCycle´s team of scientists, led by Ernie Simpson, global vice president of research and development, is about to put a clothespin on its formula that will render dirty diapers into a material suitable for plastic lumber, pallets and outdoor furniture.