Venice is sinking due to groundwater extraction

Venice, built on a lagoon in northeastern Italy, has sunk into the sea for centuries from natural and human activity. Natural subsidence results from sediment compaction, but anthropogenic groundwater extraction dramatically accelerated 20th-century sinking. From 1930-1970, industrial facilities extracted groundwater for manufacturing and petrochemical processing. This extraction removed aquifer fluids, causing overlying sediment compaction—hydrocompaction. Groundwater extraction caused approximately 13 centimeters subsidence during this period, more than the natural rate. Extraction halted in 1970s, slowing subsidence considerably, but the damage was permanent. Venice now sinks 1-2 millimeters yearly from natural causes, but combined with rising sea levels from climate change, this contributes to Venice's increasing flood vulnerability. The Modulo project—massive engineering effort installing inflatable flood barriers—was completed in 2020. Venice's situation represents a cautionary tale about groundwater extraction's unintended consequences.