What if a city bench could provide a place not just to sit but also to breathe a little easier? That's the idea behind CityTree, a 14-foot-high moss-covered, energy-efficient bench and air purifier that is popping up in cities throughout Europe and Asia. This article is part of Changemakers' Playbook, a series that looks at innovation across different industries. Peter Sänger, a horticulturist turned entrepreneur, founded Green City Solutions to develop solutions to the problem that combine technology and sustainability.It kills 7 million people a year and causes diseases including lung cancer and pneumonia.Air pollution poses a serious health threat to people living in cities around the world.
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