Instituto Nacional de Estadística (INE)

EPA (United States environmental Protection Agency)

EPA (United States Environment Protection Agency)

U N E P / W H O / H A B I TAT / W S S C C

Institute for Prospective Technological Studies (IPTS)

Instituto de Prospectiva Tecnológica (IPTS)

Institute for Prospective Technological Studies (IPTS)

Ministerio de Medio Ambiente

Eurostat;Unión europea

United States Environmental Protection Agency (EPA)