In many cases, this real estate that is coveted for its proximity to the beach is disrupting natural processes and in many places, increasing the rate of erosion.
Compounding the problem are the jetties, groins and other man-made structures built to keep sand from moving.
"Once you block the movement of sand, it may move to deeper areas offshore instead of replenishing the beach," said Kristina Hill, an associate professor at the University of California, Berkeley.
Combine this with rising seas and more intense storms caused by the climate crisis, and you have an existential threat to some of the best beaches around the world.
"As sea levels rise, that beach wants to be somewhere inland. And in order to try to get there, we expect that it will take away the beach much faster than it is right now," said Orrin Pilkey, director emeritus for the Program for the Study of Developed Shorelines."Sea level rise will spare nobody."
8 popular beaches are: Waikiki Beach, Honolulu, Hawaii, South Beach, Miami Beach, Florida, Copacabana Beach, Rio de Janeiro, Surfers Paradise, Gold Coast, Queensland, Australia, Ocean City, Maryland, Santa Monica Beach, Los Angeles, Barceloneta Beach, Barcelona, and Ocean Beach, San Francisco
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