Extinction Rebellion is a global movement using non-violent civil disobedience to prevent mass extinction and reduce the risk of social collapse. On October 31, 2018, British activists gathered in Parliament Square, London, to declare a rebellion against the UK government. Thousands peacefully blocked bridges and held symbolic actions, including planting trees and protesting at Buckingham Palace. The movement quickly spread worldwide, forming new nodes across Europe and the U.S. Extinction Rebellion thrives without leaders, gaining strength from diverse perspectives and energies brought by each new group.