Venice has been keeping flood records for 150 years, though it is generally understood that the city has been regularly flooding since the very beginning. It usually happens between the fall and the spring and the earliest record is believed to be from the 6th century.
This past week, Venice saw its acqua alta (or high water) peak at 187cm (6'2") above its normal level. This is the second highest number on record and is just below its 1966 peak. At these numbers, about 80% of the historic center is underwater. Here is a chart from the WSJ explaining that:
Venice has been working on a flood management project called MOSE since the 1980s. The name is an acronym, but there's a deliberate biblical reference here. Remember when Moses parted the red sea?
The project has been mired in engineering delays and corruption scandals, and so it's not yet operational. If it were, it would have, in theory, protected the city this past week. 2022 is the anticipated completion date, but I don't know if that's realistic or not.
The system consists of 78 mobile gates that fill with water and sit flat on the seabed when the tide is low. When a high tide is predicted, the gates are then to be pumped with air so that they rise (hinged on one side) and close off the three inlets that connect the Venetian Lagoon to the Adriatic Sea.
As I was reading about this project and everything else that has been going on in Venice this past week, I became curious about how exactly the Dutch have been managing to hold back the sea. I mean, a big chunk of the Netherlands sits below sea level.
If you're also curious, here's a video that explains how they do it.
According to this recent Bloomberg article, the world is expected to add more than 3 billion people by 2100. At the same time, the global average fertility rate is dropping. In 1960, it was five live births per woman. As of 2017, it had dropped to 2.43.
About half of all countries are now below the rate of replacement, which means they're relying on immigration (places like Canada) and/or they're relying on labor productivity gains to keep their economy growing (places like China).
The article is also fascinating in that it begins to consider the economic and cultural forces that shape the above fertility rates. Women in Saudi Arabia, for example, have one of the lowest labor force participation rates in the world. Only about 25% are in the workforce.
If you'd like to read the full article, you can do that here.
Image: Bloomberg
I was talking about this with my friend Evgeny Tchebotarev last night:
The transfer of sovereignty over Hong Kong (also known as the handover) happened at midnight on July 1, 1997. At the time, Hong Kong had a population of about 6.5 million people and China had a population of about 1.23 billion people. But Hong Kong punched well above its weight class and its GDP as a percentage of mainland China's GDP was about 18.4% (see above). In other words, Hong Kong represented about 0.53% of the population, but almost 1/5 of China's economic output. Today, well as of 2018, this number has declined to 2.7% (again, see above). Hong Kong still possesses a number of structural benefits compared to mainland China, but its position as a global financial center is not guaranteed.
Graph: Investopedia
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