Protesters across Europe are calling for a halt to new large-scale data centres over concerns about their electricity and water use.
More than 100 groups backed the two-day campaign, which saw around 90 demonstrations across 15 countries, including Finland, France, Germany and the UK.
In Amsterdam, protesters broke into a Microsoft construction site and clashed with police, who detained up to 200 people. Activists warned that the facilities could drive up power bills and compete with households and businesses for water.
The European Union plans to at least triple its data centre capacity within five to seven years.
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