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Media player Video. An alternative to urban trees known as "bio-curtains" is being developed by a team of architects and scientists in London. The curtains use the power of algae to absorb carbon dioxide from the air. The architects EcoLogicStudio created the technology in collaboration with University College London and University of Innsbruck. A smartphone film by digital reporter Dougal Shaw. Go to next video: Unleashing the power of moss to clean cities. MOST WATCHED. Why you can trust BBC News Full story

20 July