Core Viewpoint - Greta Thunberg, known as the "climate activist," was banned from entering Venice for 48 hours and fined $172 for dyeing the Grand Canal green with the environmental group "Extinction Rebellion" [1][3] Group 1: Incident Details - Thunberg and 35 companions used a non-toxic fluorescent dye, typically employed in environmental research for water flow tracking and leak monitoring [3] - The action aimed to raise awareness about the impacts of climate collapse [3] Group 2: Reactions - The mayor of the Veneto region, Luca Zaia, criticized the act as disrespectful to the city's history and fragility, warning of potential environmental consequences [3] - The Italian authorities imposed a 48-hour ban and a fine on Thunberg and her group for their actions [3]