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Subject
- Heal the World144
- Power the World99
- Feed the World94
- The World's Water70
- Ignorance is Not Bliss: Can Schools and Technology Help?59
- Recover, Reuse, and Recycle: Building a Lasting World45
- Recover, Reuse, Recycle40
- Livable Cities37
- Biosphere, Atmosphere, and Human Fears27
- Extinction: Who Will Survive?27
- Shelter the World18
- Climate Change12
- Seeking Sustainability12
- Designing Progress: Living on the Edge9
- Culture, Technology, and Human Rights in the Developing World7
- Humanitarian Engineering: Past & Present4