In Barcelona, Spain, researchers at Universitat Politècnica de Catalunya (UPC) have found an innovative solution to the long-established emissions problem. Science Daily reports that they discovered how to build megastructures with a biological concrete that not only lowers CO2 and regulates heat, but is pleasing to look at.

It is not only a medium for growth and a construction material, but a means to regulate temperatures indoors while removing CO2 from the atmosphere.  The surface of the concrete grows mosses, lichens, fungi and other biological organisms.

The invention needs to be used in regions with a calm Mediterranean climate, but enables buildings to absorb CO2 and release oxygen with micro-algae and other "pigmented microorganisms" that coat it.

While vertical gardens certainly enhance its aesthetic appeal, one might declare that its beauty is sourced in its clever design.