Study says Tokyo, Osaka, other mega-cities will be swamped by surging sea levels, even at 2 degrees Celsius rise A spike in Earth’s temperature of 2 degrees Celsius (3.6 degrees Fahrenheit) would submerge land currently occupied by 280 million people, while an increase of 4 degrees Celsius - humanity’s current trajectory - would cover areas populated by more than 600 million people, the study said.
In the capital, 7.5 million people - 30 percent of Tokyo’s population - would be affected by the sea level rise under the 4 C scenario. A rise by 2 C would leave 4.2 million people’s homes underwater.
In Osaka, 6.2 million people - a staggering 38 percent of its population - would be affected under the 4 C rise. Under the 2 C scenario, the city would still see 4.2 million affected.
Sea level rises corresponding to these 2 C or 4 C scenarios could unfold in two hundred years, but would more likely happen over many centuries, perhaps as long as 2,000 years, according to the research, published by Climate Central.
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