Where do balloons go when they fly away?

Colored balloons are so beautiful, especially those inflated with helium! Yes, they are beautiful, but they are dangerous as well and unfortunately most people are unaware of it. The pollution caused by balloons is a growing problem with deadly consequences. Although it can be totally preventable, millions of balloons are intentionally released in the environment every year. What happens to balloons once they are released? Where do they go? Actually, they don’t disappear: sooner or later they return to Earth as litter. Since they are light and made of quite resistant plastic, they can fly for hundreds or even thousands of miles and land anywhere, they pollute the most remote…