Impact of archeology in the world, in general and in personal.

If we think of any way that archeology could affect the world, probably the direct answer is that is thanks to the archeology that we know the history of the civilizations that were not able to let their legacy and story written. Archeology builds up the story of the world, and as we know, the people who doesn't know about their past are condemned to make the same mistakes as their ancesters. An archeologyst helps by finding and investigating trails from the past so they can be put in the global history to fill gaps, deny or confirm theories, etc. 

Maybe a more personal impact could be the fact that an archeologyst will not always find objects from the ancient times. While doing an excavation it could be found something that you may feel in the obligation to return, like a bag with the personal belongings of someone who got robbed 40 years ago, and theres still objects from the 80's. Searching and finding the legitimate owner it's not something that will change the world, but you would feel like you already returned someone a piece of their past.