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IUCN, the International Union for Conservation of Nature, helps the world find pragmatic solutions to our most pressing environment and development challenges. IUCN supports scientific research; manages field projects all over the world; and brings g...

The Union is the only international voluntary scientific organisation with partners providing a neutral platform to fight TB, HIV, asthma, tobacco and lung disease, in low- and middle-income countries through technical assistance, education and resea...

The Union of Concerned Scientists is the leading science-based nonprofit working for a healthy environment and a safer world through a combination of independent scientific research and citizen action.

IHEU is the world union of over 100 Humanist, rationalist, secular, ethical culture, atheist and freethought organizations in more than 40 countries. Our mission is to represent and support the global Humanist movement. Our goal is a Humanist world i...

International Mathematical Union (IMU)

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