Back to Headlines
Environment
Apr 19, 2026

Venice seeks flood plan B as sea level rise threatens city's future

AI Summary
Venice is looking for a plan B to protect itself from flooding as sea levels rise, despite its Mose flood defence system having saved the city 154 times since its launch in 2020.

Venice, a city renowned for its rich history and cultural heritage, is facing an unprecedented threat from rising sea levels. The Mose flood defence system, which was launched in 2020, has saved the city from potential flooding 154 times. However, despite its success, the city authorities are already seeking a plan B due to the accelerating sea level rise.

The Mose system, which stands for modulo sperimentale elettromeccanico (experimental electromechanic module), was designed to protect Venice from frequent acque alte (high waters) caused by storm surges. The system consists of massive, luridly coloured flood barriers sunk into the seabed at three inlets between the lagoon and the Adriatic. The barriers have been effective in preventing flooding, but their frequent use is damaging the lagoon's ecosystem.

Rising sea levels due to the climate crisis mean engineers are forced to raise the flood barriers more frequently, which encourages an excess growth of algae. When the algae die, they decompose, sucking out all the oxygen in the water and killing off fish and other marine flora. The tides create a natural exchange of water and sediment between the Venice lagoon and the Adriatic, but the raised flood barriers block the flow of water, leading to a deterioration of the lagoon's ecosystem.

Andrea Rinaldo, the head of the scientific committee of the newly appointed Lagoon Authority, warns that an estimated extra metre of sea level rise by the end of the century represents a 'death knell for the city'. He stresses that immediate action is necessary to prevent the city's destruction. 'You won't have a lagoon. You won't have a city. And all of this could happen in a timeframe that is comparable with the time that we had to design and build the Mose.'

The city authorities are exploring alternative solutions, including redirecting Venice's economy away from its reliance on tourism, which is a major threat to the city. Rinaldo plans to put out a global call for ideas from leading thinkers across various disciplines to devise a proposal for the city's future.