After training as an architect, Cameron Sinclair (then age 24) joined Kate Stohr to found Architecture for Humanity, a nonprofit that helps architects apply their skills to humanitarian efforts. Starting with just $700 and a simple web site in 1999, AFH has grown into an international hub for humanitarian design, offering innovative solutions to housing problems in all corners of the globe. Whether rebuilding earthquake-ravaged Bam in Iran, designing a soccer field doubling as an HIV/AIDS clinic in Africa, housing refugees on the Afghan border, or helping Katrina victims rebuild, Architecture for Humanity works by Sinclair's mantra: "Design like you give a damn." (Sinclair and Stohr cowrote a book by the same name, released in 2006.) A regular contributor to the sustainability blog Worldchanging.com, Sinclair is now working on the Open Architecture Network, born from the wish he made when he accepted the 2006 TED Prize: to build a global, open-source network where architects, governments and NGOs can share and implement design plans to house the world. "Cameron Sinclair is doing his best to save the world, one emergency shelter and mobile AIDS clinic at a time." Washington Post