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Initiatives by topic
Education for sustainability
Native Seeds/SEARCH, nonprofit organization working to strengthen food security in the Greater Southwest
Sustainable transport activism
Sun Link, The Tucson Streetcar, (Wikipedia): Sun Link, also known as the Tucson Modern Streetcar, is a single-line streetcar system in Tucson, Arizona, United States. It opened on 25 July 2014, serving an estimated 17,000 riders on its opening day. The system's 3.9-mile (6.3 km) route connects the Arizona Health Sciences Center (including University Medical Center), the University of Arizona campus, the Main Gate and 4th Avenue shopping and entertainment districts, Downtown Tucson, the Tucson Convention Center, and the Mercado District under development west of Interstate 10.
Wikipedia: Hiking trails in Arizona (category)
Towards sustainable economies
Borderlands Restoration Leadership Institute, "Project-Based Learning Laboratory Cultivating a Restoration Economy in the U.S-Mexico Borderlands"
News and comment
Google’s new driverless car test wants everyday families to be first riders, Apr 25 
Apr 2 Cyclovia Tucson
Oct 30 Cyclovia Tucson
Citizens data initiative