The list of school climate strikes lists school student strikes associated with the school strike for climate movement. The strikes began on 20 August 2018, when Swedish schoolgirl Greta Thunberg went on strike daily for several weeks, before switching to striking every Friday. The days of the largest strikes worldwide have been on 15 March 2019 (over a million people), 20 September 2019 (4 million people) and 27 September 2019 (2 million people). These September 2019 climate strikes were estimated to have involved up to 7.6 million people globally.