Addressing a Group's Anxiety

John Kenneth Galbraith once said, "All of the great leaders have had one characteristic in common: it was the willingness to confront unequivocally the major anxiety of their people in their time. This, and not much else, is the essence of leadership."

In the context of speaking to a group, what can you do to address their major anxiety and give them a path, or hope, so as to raise the value and impact of your presentation?