“If you walk along the Westerdok canal in Amsterdam, you might not notice a line of bubbles moving across the surface. But underwater, a tube stretches along the bottom of the canal, pushing air upward. It’s a pilot test of new technology, called the Great Bubble Barrier, designed to help catch plastic waste before it flows into the North Sea.”
View the whole story here: https://www.fastcompany.com/90454481/a-simple-burst-of-bubbles-is-keeping-this-river-clear-of-plastic