Wide spread poverty across developing nations is common knowledge among the citizens of developed countries, yet the solution to this problem isn’t. Most people simply donate money to build a school or some very small contribution which invariable gets lost before it makes a real impact in the lives of the impoverished. Root Capital is the most prominent organization fixing the problem. 
The World Bank estimates that a growth in the agricultural sector will be twice as effective at reducing poverty in an economy as any other respective sector. Root Capital provides loans to small business, so that they can buy sustainably grown produce from farmers, and hold a constant stream of income for the many families which make a living from growing produce.
Sources: http://www.forbes.com/sites/helencoster/2011/11/30/forbes-list-of-the-top-30-social-entrepreneurs/