Mexican start-up fights air pollution with artificial trees

  PUEBLA, Mexico -- Trees are one of the best things we have to clean the Earth's air, but they have certain drawbacks: they need time and space to grow. Enter the BioUrban, an artificial tree that sucks up as much air pollution as 368 real trees. Designed by a Mexican start-up, the towering metal structure uses microalgae to clean carbon dioxide and other contaminants from the air, returning pure oxygen to the environment. Measuring 4.2 meters (nearly 14 feet) tall and nearly three meters wide, the device looks something like a cross between a tree and a post-modernist high-rise, with a steel trunk that radiates rising bands of concentric metal. "What this system doe...

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