Your favorite beaches could disappear
BERKELEY, Calif. - It's easy to see why millions of people flock to the beach every year.
They are dynamic places -- and not just because they're great for relaxing, surfing or people watching. With each crashing wave and changing tide, billions of pieces of sand and rock are constantly rearranged.
This is what nature intended.
What it did not, some scientists say, are the buildings that tower over some of the world's most popular beaches.
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.