http://an-emission-impossible-world.blogspot.com/2013/12/ancient-pollution.html http://an-emission-impossible-world.blogspot.com/2013/12/anc... The romans were

http://an-emission-impossible-world.blogspot.com/2013/12/ancient-pollution.html http://an-emission-impossible-world.blogspot.com/2013/12/anc... The romans were producing a huge amount of lead and other metals at levels not achieved again until the 18th century. The graph is pretty striking. And it's a logarithmic graph so doesn't give the full perspective of just how ahead of their time they were.