I need some examples perhaps, or just topics that I could choose for this reasearch project I have to do.
It all has to be on a World Impact though.

Anyone have any suggestions?

Can write about someone that has greatly influenced the world?
I'd say Al Gore. I loved An Inconvenient Truth.

Or maybe you could write about how every little thing we do changes the world.

How long does it have to be? The first thing that came to mind was the American Revolution because there's so much to right about, but it really depends on how narrow you want your topic to be.