Forget trying to change the world today.  That's a big task for one person.  The time you spend trying to turn the Earth on its axis could be time better spent trying to change just your world.

Make a difference in your group, in your community, in your neighborhood, in your school, in your class, in your office, in your family, in your condo building, in your photography class.

Start small and grow from there.  Remember how Andy Dufresne tunneled out of prison with his rock hammer?  It's kinda like that.