McKinsey & Company's Top 11 Social Innovators Saving The World In 2011 (VOTE)

McKinsey & Company's Social Innovation Video Contest highlights innovators who are confronting the world's greatest challenges and gives participants the chance to publicize their organization and encourage involvement.

After receiving nearly 150 videos from 30 different countries, the contest has narrowed down its top entries to just 11.

Of course, when the range of innovations include issues such as sanitation and water distribution, to education and green energy -- the real challenge might be choosing just one winner.

WATCH the videos below and vote for the top innovation.