Final answer:
A global citizen is someone who identifies themselves as responsible to a world community rather than just a national one. This concept is closely related to cosmopolitanism, where individuals primarily define themselves as citizens of the world. The belief in global citizenship can vary depending on the economic and political climate.
Step-by-step explanation:
A global citizen is a person who sees themselves as responsible to a world community rather than only a national one.
In times of prosperity, sentiments favoring a world community grow, while in times of strife, people tend to revert to more local, national identities.
The concept of global citizenship is closely related to cosmopolitanism, which is the idea that one should define oneself primarily as a citizen of the world and not of any particular nation.