When the mind is at peace, the world is at peace. Are you willing to put some effort toward making your mind peaceful? Failure is impossible when any honest and consistent effort is taken toward this intention.
I know that more than any other action toward world peace this action will bring it to fruition, but only if you are willing. To dream of something better is just a dream without an unbending intention and effort.
Instead of asking for world peace, ask how you can bring stillness to your mind. Take action as needed toward this goal and then watch the world change.