That's what the city of London spends each year to remove chewing gum from subway trains and stations. U.K.-based Revolymer is developing a new kind of chewing gum that will wash easily off of any surface. From an article on TechnologyReview.com:
The gum easily comes off roads, shoes, and hair, and it barely sticks at all to some surfaces.
About 600,000 metric tons of chewing gum are manufactured in the world every year, Pettman says. A large percent of that ends up on streets and pavements, becoming a pollution issue.
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