I have only just begun to compile this "master list" from (1) the individual webpages at ieinfo.net and (2) other hard-to-categorize NGOs. As I compile these, I'm doing it in batches, so the betalphatizing might be a bit shakey...it is, in short, just a start...
• Formerly the Pew Center on Global Climate Change
Planned Parenthood Global (PPFA's international arm)
NGO listings at ienfo.net and beyond
Many subject-specific webpages at ieinfo.net contain a section entitled something along the lines of "Institutions" or "NGOs." Keep in mind that sorting them in such a way risks dramatic oversimplification. Take, for example, WWF, one of the more widely recognized environmental NGOs; WWF could be reasonably listed as nature-focused, education-focused, economy-focused, etc. This holds true for most NGOs. Also note that the NGOs listed on this page and throughout ieinfo.net constitute only a partial sampling of the world's thousands of environmental NGOs. The following links contain additional listings