A resident pours his rubbish into a garbage disposal chute outside his apartment block in Hammarby Sjostad. The Hammarby Sjostad district, a former brownfield site, is now being redeveloped to provide environmentally friendly, ecologically sustainable residential housing. The complex uses large underground tanks to store household waste, which is collected twice a week for sorting and recycling. The organic waste from the complex, including the sewage, is turned into biogas and waste that cannot be recycled is burnt to provide central heating. The development, which is expected to be finished in 2015, will be one of Stockholm's largest eco projects.