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2013 Buckminster Fuller Challenge Semi-finalists announced

2013 Challenge Semi-finalist: The Loowatt System. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: Regenerating Healthy Soils Through Sustainable Sanitation (SOIL). Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: Mushroom Packaging (Ecovative). Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: Public Laboratory for Open Technology and Science. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: Bioenergy Value Chain. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: Healthy Watersheds for Clean Energy. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: TBS River Regeneration. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: The Green Chemistry Commitment. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: International Bridges to Justice Legal Training Resource Center. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: Voltree Acoustic Early Detection Sensor System. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: 100,000 Homes Campaign. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: Fundacion Paraguaya/Eliminating Poverty Through the 'Traffic Light' Strategy. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: Échale a tu Casa. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: MASS Design Lab: Building Systemic Change. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: Build Change's Homeowner-Driven Technical Assistance for Safer Housing. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: PITCHAfrica: Waterbank Schools. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: Ento. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: Olazul: Ecological Shrimp Aquaculture. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: Cooperafloresta/Agroforestry Reconnecting People and Nature. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: International Bridges to Justice Legal Training Resource Center. Photo courtesy of challenge.bfi.org.

2013 Challenge Semi-finalist: International Bridges to Justice Legal Training Resource Center. Photo courtesy of challenge.bfi.org.