If we're going into specifics, and especially if the specific is the island of Ireland, then:

Ron Kavanah's "Reconcilliation"

Colum Sand's "Throw the ball against the wall" (may not be the actual title).

Personally songs which just say how wonderful God's earth is (such as "Glad that I live am I"; sorry, Ian C) are more likely to induce depair than hope in me; if there's any hope to be had it has to come from our efforts to make something out of this (man-made) mess in which we find ourselves.

G.