www.un.org   
United Nations Population Information Network
A guide to population information on UN system web sites
    

 
United Nations Environment Programme (UNEP)
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   Encourages sustainable development through sound environmental practices everywhere. Its activities cover atmosphere and terrestrial ecosystems, the promotion of environmental science and information, and early warning and emergency response capacity to deal with environmental disasters and emergencies.
 
Global and Regional Integrated Data centres (GRID)
  The GRID database is maintained for the purpose of assisting the international community and individual nations in making sound decisions related to resource management and environmental planning, and where applicable providing data for scientific studies. (GRID Geneva)