After six feet of water inundated the city of Venice Tuesday, Mayor Luigi Brugnaro declared that the flooding should not be considered normal but rather the result of the climate crisis.

The highest water level in 50 years led Brugnaro to ask Italy's government for assistance and to declare a state of emergency in the city after at least two people were reported dead in the flooding.

"These are the effects of climate change," the mayor tweeted in Italian on Tuesday night.

Anche oggi affrontando maree che segnano record negativi. Domani dichiareremo lo stato di calamità. Chiediamo al #Governo di aiutarci, i costi saranno alti. Questi sono gli effetti dei cambiamenti climatici. Il Mose va terminato presto. Domani scuole chiuse a Venezia e isole. pic.twitter.com/iD2Y7mbOBf — Luigi Brugnaro (@LuigiBrugnaro) November 12, 2019

This week's flooding marked the second-highest water level recorded in Venice since city officials began keeping flood records in 1923. In 1966, the city was overwhelmed by six feet, three inches of rain water flooding the streets.

The ancient cathedral St. Mark's Basilica flooded Tuesday for only the sixth time in 1,200 years, according to the BBC—but church officials said four of those times have been in the last two decades as fossil fuel emissions and sea levels have both gone up.

"I usually associate climate change with dramatic catastrophe like hurricanes and forest fires but this is silent and creeping," one local observer wrote. "Residents are adapting by scheduling meetings earlier or later, shops place wooden barriers to block water and there are ramps in low elevation spaces but it is clear that it is getting worse every winter."

Greenpeace cautioned against dismissing the flooding as the result of Venice's location in the Venetian Lagoon.

"From north to south, Italy has been impacted by a series of extreme climate events," Greenpeace Italy tweeted. "What's happening in Venice is a powerful example. This is not just 'bad weather,' this is a climate emergency."

Climate experts Katharine Hayhoe, Eric Holthaus, and Bill McKibben added that the climate crisis is worsening weather events' effects on the low-lying city.

Climate experts—including Katharine Hayhoe, Eric Holthaus, and Bill McKibben—noted that low-lying cities like Venice are becoming increasingly vulnerable to extreme weather and rising seas caused by rising global temperatures.

Exposure (people, infrastructure, buildings, historical monuments) + vulnerability (low-lying land, subsidence) + natural variability (high tide) = danger + human-induced climate change (sea level rise) = disaster Climate change is a threat multiplier https://t.co/CX9FqOjtRT — Prof. Katharine Hayhoe (@KHayhoe) November 13, 2019

Today was the worst flooding in Venice in 50 years. The mayor has declared a state of emergency. All because of a full moon, an unfavorable wind direction, and more than a century of using fossil fuels. We are in a climate emergency. https://t.co/WEORwd3HQc — Eric Holthaus (@EricHolthaus) November 13, 2019

Beautiful Venice is a "city on its knees" after high tide inundates St. Marks Square with 5 feet of water.

Sea level is "rising faster than expected."https://t.co/SXtQo0goie — Bill McKibben (@billmckibben) November 13, 2019

The Italian government announced earlier this month that school children would be required starting in 2020 to study the climate crisis as part of their curriculum, in an initiative pushed by Education Minister Lorenzo Fioramonti. But the government is still influenced by the far-right opposition party Lega, led by climate change denier Matteo Salvini, who remains the country's most popular politician.

"Now the government must listen," Brugnaro said.