Researchers in Spain have developed a “living concrete” that grows moss, lichens and fungi that could turn city buildings into giant air purifiers The concrete is porous and acidic and acts almost like soil for moss, lichen, fungi and other drought-tolerant vegetation. They are using the material to construct prototypes of office building that is capable of sucking in more CO2 and pollution out of the air than thousands of trees, while providing breathable oxygen.
https://returntonow.net/2020/02/03/new-living-concrete-allows-plants-to-grow-right-out-of-the-wall/
