Discharging is a process to neutralize a charged object by removing the excess charges.
The intense heat causes the air surrounding the charged object to be ionized. The ions in the surrounding air then neutralize the excess charges in the charged object.
(2) Humid Conditions
The water vapour in the air helps to remove the excess charges on the charged insulator.
A charged conductor can be neutralized by earthing it.
It is to provide a path for excess electrons to flow away from the negatively charged conductor or for electrons to flow from earth to the positively charged conductor. This will cause the conductor to lose its charge and become neutral.
This can be easily done by touching the charged conductor with our hand.