The National Association of Independent Schools is sponsoring a project called the Challenge 20/20 project. Check it out here: http://www.nais.org/resources/index.cfm?ItemNumber=147262
In a nutshell, they use Jean Francois Rischard's book High Noon: 20 Global Problems, 20 Years to Solve Them as a framework. Schools are partnered with one another based upon which issues they'd like to address. The deadline for participation is July 23rd.