We are the way we are today, because we are the world, and the world is us!
The world is nothing else but a reflection of ourselves and shows the state of our conscious.
There is no "outside" world!
So, if you wanna change the world, start there where you are. Be kind to others. Live with an opened heart in the here and now.
In doing so, you surrender to the Devine, and that will take care of the rest and guide you to the best path possible for you.