If I wished for enough food to feed all of humanity. A vast plague would consume the human population leaving but a handful which could be sustained.
If I wished for an end to pollution, then humanity would fall extinct and the world would be left to mend.
If I were to wish for an end to war, we would have a war so frightening as to never again raise a weapon.
Therefore, I would not write a thing; not a word. Instead I would destroy it.