Comprehensive Nuclear Test Ban Treaty (CTBT)
Overview
The Comprehensive Nuclear-Test-Ban Treaty (CTBT) is an international organisation that bans nuclear explosions by everyone, everywhere: on the Earth's surface, in the atmosphere, underwater and underground.
It makes it very difficult for countries to develop nuclear bombs for the first time, or for countries that already have them, to make more powerful bombs. It also prevents the huge damage caused by radioactivity from nuclear explosions to humans, animals and plants.