World Hunger

Do you think that affluent nation such as the US have a moral obligation to do the most they can in order to relieve world hunger?  What is the extent of such a moral obligation?  If you answer in the affirmative, state clearly and in detail the moral basis of such a moral obligation.  If you answer in the negative, explain why there is no such a moral obligation.  In your answer, critically examine either Singer’s position or Rolston III’s position. 

I expect a professionally written essay that follows the above outline.