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The insured doesn't mind paying for a (negative expected value) policy because the peace of mind is worth much more than the premium.
The insurer doesn't mind because they're making many bets across many flood plains.
The insurer is basically making money by charging a small premium to coordinate and ensure different people help each other out when they get unlucky.
As soon as flooding is guaranteed, there is no point of insurance since the premium is equal to the coverage provided.
It really doesn't need a source. If Venice takes too much water from an aquifer then subsidence is unavoidable. The city is sitting on top of a sponge, after all. This is true for any city that's not built on bedrock (which I believe includes half of Manhattan and Miami. NYC of course draws from the Hudson)
Anyway, as the paper states the subsidence exasperates rising sea levels.
McDonald's outside of the USA is supplanting rich cultural histories.
Tourism, especially as practiced by those who eat at McDonald's while visiting a foreign country, is typically disastrous to the local way of life. Locals end up selling trinkets to people for afar with more money then sense. Eventually the city becomes affordable and unbearable for the locals and the city becomes a lifeless shell of what it once was. Insipid like Las Vegas.
Arguably its bad food. Anyways its mass produced food that has no attachment to the place where it is consumed (outside the USA). Food, like the appreciation of a city, has a cultural aspect that McDonald's lacks.
McDonal's for someone visiting Europe makes no sense at all. You've dropped a few thousand in airfare and hotels, now you're being cheap on the food?? (Here I make an exception for Europeans eating McDonalds. They live there, they know their culture and their food. Go ahead stuff your pie holes just for the purpose of filling your bellies).
"Disneyland is also great."
idem for Disneyland. It's a fake image of a medieval utopia that never existed even in fairy tales. It's purpose is to create value to the Disney brand by becoming, through sheer force of the ubiquity of the Disney company, a part of children's childhood replacing real experiences and the myths handed down through generations. You don't learn anything at Disneyland, you do not grow as a person at Disney because there is no substance to Disneyland.
At best you have "fun", whatever that means. More likely you're told you had fun, and you repeat that to yourself to avoid admitting you mostly just waited in line.
Venice as Disneyland is a place where hoards of bucketlisters checkoff yet another selfie at Piazza San Marco (or is Piazza Spagna? who remembers? who cares!?), not for the San Marco's sake, but to pretend they accomplished something merely by buying a cheap ticket and airbnb.
You made it to Venice! Big deal! How hard is that?
No. A person who wakes up 4:00am to make it to San Marco at dawn to see San Marco alone has accomplished something (albeit small). A person who goes to Venice and doesn't go to Piazza San Marco, but instead spends the whole time alleys long forgotten by the hoard has accomplished something.