World AIDS Day: As the world heads into the fourth decade of AIDS, it is finally in a position to end the epidemic, Secretary-General Ban Ki-moon said today, leading a chorus of United Nations officials in calling for the political will, investments and determination to reach this goal. “Momentum is on our side. Let us use it to end AIDS – once and for all,” Mr. Ban said in his message for World AIDS Day, observed on 1 December each year.