The anti-nuclear movement is a group of people who want to stop the use of nuclear energy. Nuclear energy is the energy that comes from splitting atoms in a special kind of machine called a reactor. People in the anti-nuclear movement want us to stop using reactors because they think that it could be dangerous. They worry that if something goes wrong with the reactor, it could hurt people or cause pollution. They also worry that nuclear energy is too expensive and that it causes too much waste. People in the anti-nuclear movement want us to use renewable energy sources like solar and wind power, which are safer and cheaper.