What If Walls Could Protect Coastal Cities Against Rising Sea Levels?

The climate crisis is one of the biggest issues facing humanity. Ice sheets are melting due to Earth's increasing temperature. Because of it, the sea level is rising 4.8 mm (0.19 in) per year. It seems such an insignificant number. So why are experts so concerned? Scientists predict that by 2050, water levels in 570 coastal cities worldwide will rise by half a meter (1.6 ft), threatening 800 million people. In some cities, the authorities have already responded by building coastal walls for protection. In other cities, they are discussing the possibility of making walls. Which coastal cities are the most threatened? How would you build the walls? How long would these walls need to be? Which coastal city is most at risk?

Transcript and sources: https://whatifshow.com/what-if-walls-could-protect-coastal-cities-against-rising-sea-levels/

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