-          Official international bodies

o          United Nations Environment Programme

o          European Environment Agency (EEA)

o          Environmental Protection Agency

-          Official national bodies

o          Ministry of the Environment

o          Centre for Environmental Sciences (CCMA)

o          Puertos del Estado (EPPE)

-          Organisations and companies

o          Research Centre for Energy, Environment and Technology (CIEMAT)

o          "Entorno" Foundation

-          Utilities

o          Directory of Environmental Websites. Web Directory

o          International Network for Environmental Management

o          The Global Directory for Environmental Technology