History of Ancient Copper Smelting Pollution During Roman and Medieval Times Recorded in Greenland Ice 
http://oodagurus.com/forums/member.php?action=profile&amp;uid=50677 
 
Challenges of Copper Shortages in Manufacturing 
http://forums.syzygy.ltd/index.php?action=profile;area=showposts;u=861479 
 
 
The Future of Copper: Will the looming supply gap short-circuit the energy transition? 
http://demo.projecthades.org/showthread.php?tid=520&amp;pid=12760#pid12760 
 
Abandoning fossil fuels bumps into high demand for copper 
http://jkm666.com/forum.php?mod=viewthread&amp;tid=1605344&amp;page=1&amp;authorid=147675 
 
Why Is Copper Used So Much In Making Electrical Wires? 
http://xianyu.imotor.com/viewthread.php?tid=1519&amp;extra= 
 
Copper Demand and Long-Term Availability 
http://pittance.org/viewtopic.php?p=9464#p9464