Plant-covered facades help cool urban areas and provide habitats for plants, birds, insects and other organisms. An international team of researchers has drawn this conclusion after systematically comparing green walls, bare walls, and natural cliffs. Plant-covered facades help cool urban areas and provide habitats for plants, birds, insects and other organisms. An international team of researchers has drawn this conclusion after systematically comparing green walls, bare walls, and natural cliffs. Plants & Animals Ecology Phys.org – latest science and technology news stories