The National Geographic is droppin' some knowledge. I know some School of Public Health student is probably furious about this video for one reason or another, but I will say this: it puts things into perspective and highlights the need for social justice. The fact of the matter is, so I argue, we have a social responsibility to our fellow human being. We should help in whatever manner we can (spoken like a deontologist)
Here is Peter Singer's argument (argued from a consequentialist framework) for why we should donate money as a means of helping.
His original paper ("Famine, Affluence, and Morality") published in the premier applied ethics journal can be found here as well.