http://www.deb.uminho.pt/fontes/enviroinfo/enviroinfo.htm

EnviroInfo is a compilation of useful Internet resources to Environmental Science and Technology, maintains information on organizations, business, publications, online databases and software, research and education. The following environmental fields are considered: air pollution, biotechnology, chemistry, ecology, impact and risk assessment, laws, pollution, sustainable development, soil and wetlands, and water and wastewater.