...and even more exciting would be an atmosphere with oxygen and pollutants indicating industrialization [1]<p>[1] <a href="https:&#x2F;&#x2F;www.cfa.harvard.edu&#x2F;news&#x2F;2014-21" rel="nofollow">https:&#x2F;&#x2F;www.cfa.harvard.edu&#x2F;news&#x2F;2014-21</a>