These groups can be a good source of information. For others, you might want to look at Directory of Associations, which is a searchable list of over 36,000 associations worldwide.
International organisation that works to build better policies for better lives. Their goal is to shape policies that foster prosperity, equality, opportunity and well-being for all. they draw on almost 60 years of experience and insights to better prepare the world of tomorrow.
National nonprofit organization dedicated to improving initiatives that support prosperity through science, technology, innovation and entrepreneurship.
The United States Government is a good source of data and other types of materials. Below are some of the most useful for environmental issues. See Government Documents for essential resources in all areas of government.
National Institute of Standards and Technology (NIST)
In cooperation with industry, develops and maintains technical standards. Formerly called the National Bureau of Standards. National Technical Information Service (NTIS)
The official source for government-sponsored U.S. and worldwide scientific, technical, engineering, and business-related information.