the same is true of policies dealing with urban form and the built environment while national standards may be needed much depends on the nature of the existing buildings in a given place the materials available and the framework for zoning and land use oecd the funds for renewable energy companies that were available through the us stimulus bill of are set to end much has been made of the us federal government s loans to renewable energy firms that later went bankrupt defaulting on the loans however the us federal government has an important role in providing the conditions that would support longterm green private sector growth