Climate activist Greta Thunberg, along with members of Extinction Rebellion, participated in a protest on November 22-24, 2025, where they dyed Venice's Grand Canal bright green using a non-toxic fluorescein dye to highlight the impacts of climate change and criticize Italy's stance at the COP30 summit in Brazil.
The stunt was part of a coordinated action across multiple Italian cities, including hanging "Stop Ecocide" banners from the Rialto Bridge and flash mobs in red cloaks.
As a consequence, Thunberg and about 35 other protesters were issued a 48-hour ban from entering Venice and fined €150 (about $172) each for what officials called vandalism that disrespects the city's history and fragility.
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