Including conservation bodies, sustainability information and science and research institutes:
- Act on CO2
- Biotechnology and Biological Sciences Research Council
- British Ecological Society
- British Isles Tree Register
- British Land Reclamation Society
- Centre for Ecology and Hydrology
- Champion Trees
- Committee on Climate Change (CCC)
- Countryside Council for Wales
- Committee of the Head of Agricultural and Biological Organisations of Scotland (CHABOS)
- Edinburgh Centre for Tropical Forests
- England's Community Forests
- English Heritage
- English Nature
- English Partnerships
- Environmental Data Services (ENDS)
- Environmental Health resources - directory of Environmental Health related websites
- European Native Seed Conservation Network
- Forest Foliar Co-ordination Centre
- GB.Guide.com - directy of forestry organisations
- Grantham Research Institute on Climate Change and the Environment
- Greenspace Scotland
- Institute for Commercial Forestry Research
- International Society of Arboriculture - United Kingdom and Ireland Chapter
- Land Trust
- Macaulay Land Use Research Institute
- National Arboreta
- National Environment Research Council (NERC)
- Royal Botanical Gardens Kew
- Royal Botanical Gardens Kew seed database
- Royal Horticultural Society
- Royal Society for the Protection of Birds
- Rural Economy and Land Use Programme
- Scottish Climate Change Impacts Partnership
- Shell UK Better Britain Campaign
- South East Climate Change Partnership
- Sustainable Floors - articles about eco-friendly and sustainable flooring
- Tree Council
- TV Energy
- UK Biodiversity Research Advisory Group
- UNECE International Co-operative Programme (ICP), Forests
- UNEP Forest Restoration Information Service
- Woodland Trust