Well it would be very egocentric to think that what you personaly do can have an impact on the entire world. I mean - how can you influence a guy in distant Somalia - who never did (and never will hear of you - or many people with much more influence on the happenings in world).
But will your life make a difference?
Maybe you'll have kids and their great-grandchildren will do something so importaint that they will change the entire world (you can't know it).
But to answer that second question - if it weren't for you would somebody elses great-great-grandchildren do the same? Maybe. Maybe not.
Maybe it will be your influence that will lead them to that wonderful thing that will change the world. There isn't another you in the world; and it might be just that slight difference between you and the person most similar to you that will be crusial for changing the world.
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