The Hammarby Model, which is the district’s attempt at a balanced, “closed-loop urban metabolism”, accounts for the unified infrastructure of energy, water and waste. In addition to the Hammarby Model infrastructure, the presence of urban-scaled density, access to multiple modes of transit with an emphasis on reduced car commuting, preservation and restoration of existing natural systems, and progressive construction and housing policies make Hammarby Sjostad an “effective demonstration that ecological and urban go together” by means of comprehensive planning (Beatley 2004:251, 255).