Beijing has the worst smog levels among the world's capital cities - so bad that playing sports outdoor is often banned - but it could get a stunning new set of lungs in the form of a covered botanical garden, retail and office complex under a giant transparent roof.
Called Bubbles, the architectural concept might seem an unlikely candidate for a high-rise city of 21 million people. But its designers believe it offers something that every urban environment needs. — South China Morning Post
Another Chinese bubble to burst?