However, we have to admit that sometimes citizens, as well as nations, could appear selfish and shortsighted while exhausting their environment resources for short-round benefit. In this case, we do need to call for international cooperation to restrict such behaviors and protect our common homeland.
To summarize, I would like to suggest that it is not necessary to distinguish the citizens for one country or for the globe. As long as we keep our mutual homeland, the earth, in mind, we can generally avoid the dilemma, and do what we consider right.
