We must lay one brick at a time, take one step at a time; we can be responsible only for the one action of the present moment. But we can beg for an increase of love in our hearts that will vitalize and transform all our individual actions, and know that God will take them and multiply them, as Jesus multiplied the loaves and fishes.
The highest form of intervention that an individual may offer within a given situation, is not to ask for something to be, rather to become that which is desired. If peace is THE DESIRED REALITY within the global matrix, peace must BECOME THE REALITY within the local matrix of your experience. You must BECOME THAT PEACE.