Environmental Change Network (ECN) - The ECN is the UK's long-term environmental monitoring programme. It is designed to collect, store, analyse and interpret long-term data based on a set of key physical, chemical and biological variables which drive and respond to environmental change at a range of terrestrial and freshwater sites across the UK.
Friends of the Earth (UK)
Facts and figures, reports and details of local and international campaigns. Looks good and is full of information on its subject matter.
Campaigning for a cleaner, safer and fairer world.
Greenpeace
Very large, comprehensive site. Offers the opportunity to take part in debates and find out about various topics by playing games and watching movies. The site also has extensive information about the environmental issues it is campaigning for.