Many investigations have been made towards the understanding of lightning and thunderstorms and in relating them to the global electric circuit. Great attempts have been made towards the study of the electrical environment of the EarthÂs atmosphere during the past century. The electromagnetic fields and currents connect different parts of the EarthÂs environment, and any type of perturbation in one region affects another region. The modern theory of the global electrical circuit has been discussed briefly. Interconnection and electrodynamic coupling of various regions of the EarthÂs environment can be easily studied by using the global electric circuit model. Deficiencies in the model and the possibility of improvement in it have been suggested. Application of the global electric circuit model to the understanding of the EarthÂs changes of climate has been indicated.