Reduction!!!

OK, so carbon has some great properties, it can reduce metallic oxides to the metal with CO2. Here are some reduction reactions:
2CuO+C------>2Cu+CO2

2ZnO+C------>2Zn+CO2

 2PbO+C------->2Pb+CO2

2FeO-------->2Fe+CO2  


 The figures are similar to then manufacture of oxygen using heat, where instead of KClO3

We put the metallic oxide and carbon together.
Adios!