Putting this material on roofs can help clean up smoggy air https://t.co/IisL0t6LCs

Putting this material on roofs can help clean up smoggy air https://t.co/IisL0t6LCs

— de symbol (@desymbol) November 29, 2018

from Twitter https://twitter.com/desymbol

November 29, 2018 at 08:01PM