Earth.Org has modelled what flooding on top of extreme sea level rise
sea level rise
In 2019, a study projected that in low emission scenario, sea level will rise 30 centimeters by 2050 and 69 centimetres by 2100, relative to the level in 2000. In high emission scenario, it will be 34 cm by 2050 and 111 cm by 2100.
There are numerous heavily populated sinking cities like Mumbai, Shanghai, NYC, and Miami at risk. With a population of 10 million, Jakarta is considered by some to be “the fastest-sinking city in the world” and is projected to be “entirely underwater by 2050”.
In Japan, sea-level rise of 3.3 feet (1 meter) could put another 4.1 million people at risk of flooding, and inundate more than 900 square miles of land (2,339 square kilometers) in major cities. Such a rise is well within the range of scientists’ projections, if today’s trends in global warming pollution continue.
The rest of the top 10 land losers lost less than two percent. They were, in order, Bulgaria (1.87 percent), the Seychelles (1.09 percent), Cuba (0.89 percent), Sweden (0.73 percent), Iraq (0.70 percent), Azerbaijan (0.67 percent), El Salvador (0.62 percent) and Japan (0.58 percent).
Image sourced from Atlas Obscura. Miyaji mentioned in an interview with Yahoo Japan that sea levels in Japan could rise 10 meters within 100 to 200 years from now, so action must be taken, or most of Tokyo may be underwater in the future.
In the worst case scenario, more than 17.3 billion cubic feet of volcanic ash would fall over Tokyo and the surrounding areas, according to a. That would be equivalent to 10 times the amount of debris that had to be cleared from the city after the Tōhoku earthquake and tsunami in 2011.
And in many of the most populated coastal areas, the land is sinking even faster than the sea is rising. Parts of Tokyo for instance sank by 4 metres during the 20th century, with 2 metres or more of sinking reported in Shanghai, Bangkok, and New Orleans. This process is known as subsidence.
Its main threat is the sea level rise. With an altitude of only three meters high, the water rises at a rate of 1.2 centimeters a year (four times faster than the global average), which makes Kiribati the most likely country to disappear due to rising sea levels in the forthcoming years.
Asia is particularly vulnerable to natural disasters and Japan is no exception. Climate change will exacerbate Japan’s existing vulnerabilities to such extreme weather events as typhoons and coastal storms by potentially increasing the wind speed of Japanese typhoons by 6% (ABI, 2005).
For South Florida, the region with the most coastal real estate at risk, the sobering prediction is that the sea will continue to rise — about 11 inches by 2040 — but the latest forecast is markedly less than atmospheric modeling runs produced just five years ago.
In a 2016 study, a team showed that under the worst-case emissions scenario, nearly all the West Antarctic ice sheet could be lost within 500 years. By 2100 the region’s melt could add an extra 2.5 feet to the world’s oceans.
Since the 1950s, the sea level in the New York City area has already risen 9 inches. Scientific American reports that sea-level rise over the next century could rise 5 feet (plus or minus a foot) in the New York area.
The capital of Indonesia is the fastest sinking city in the world—it’s sinking at the rate of 6.7 inches per year. By 2050, 95% of North Jakarta will be submerged, according to researchers. The region has already sunk 2.5 meters in 10 years and almost half the city is below sea level.
The enormous amount of volcanic material in the atmosphere would subsequently rain down toxic ash; across the entire US, but principally in the Northwest. The ash would also kill plants, animals, crush buildings with its weight, block freeways, and ruin the country’s farmland for a generation.
In the last century, Venice has sunk by about nine inches. Meanwhile, the waters around Venice are rising, a phenomenon that’s especially apparent in winter. The notorious acqua alta happens when an unusually high tide combines with strong sirocco winds and a storm.