>>> back now with a growing problem at america's beaches where a lot of folks have spent this first weekend of summer, the sand is disappearing at an alarming pace. our chief environmental affairs correspondent anne thompson explains why.
>> reporter: on the beach in atlantic city , you'll find children building in the sand, and adults doing the same on this new jersey barrier island. one of many battles to preserve america's beaches, under assault from coastal storms and rising sea levels , fuelled by climate change.
>> 0 to 90% of our beaches are eroding, from a few inches a year up to 50 feet a year in louisiana, which is the erosion hotspot in the united states .
>> reporter: erosion issues are closing south carolina 's polly beach county park . in san francisco , they're debating whether it's worth the effort to try to save ocean beach . the beach is where we like to play.
>> you can clear your mind.
>> reporter: it plays a critical role in our natural defense.
>> the beach is nature's protection against storms for the island and everything behind it.
>> reporter: here it means atlantic city 's famous board walk and hotels and casinos, so the beach is being fortified with this project. 1.3 million yards of cubic sand will be dredged, filtered and spread alongshore line.
>> can you just put the sand anywhere?
>> no, we want to put the sand where it's going to do the most good.
>> reporter: including at the brand new revel resort.
>> i think it will be very important, that's what we're selling. we're selling a beach front experience.
>> reporter: critics say this is just another example of man's folly, trying to replenish what the ocean is so determined to reclaim. but it can work. look at miami's south beach .
>> if we let the natural erosion proceed, we wouldn't have any beaches in south beach , miami beach or large parts of ft. lauderdale.
>> reporter: a chance no one here in atlantic city wants to
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