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Slideshow: Hacking for smarter cities and companies

Hackers met at Code for America to create sustainability apps for cities and companies.

Software developers and entrepreneurs converged in San Francisco for GreenBiz Group's hackathon during the weekend of Nov 9-11. The goal? To create solutions to challenges faced by companies, cities and others seeking to curb energy use and create smart transportation systems -- all helping urban denizens live better, more sustainable lives. Code for America hosted the event at its office.