what do you mean by Cu + H2O + CO2 + O2 = CuCo3 + Cu(OH)2 ???
it is a chemical equation of - COPPER+WATER+CARBON DIOXIDE+OXYGEN = COPPER CARBONATE + COPPER HYDROXIDE. It results to the corrosion of copper when it is exposed to damp air for a long time and thus results to form a green coating of basic copper carbonate on its surface.