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Subject
Environment
27
Learning
20
Community
17
Computing
15
Infrastructure
15
Culture
13
Heal the World
12
Industry
12
Extinction: Who Will Survive?
11
Health
9
Livable Cities
9
Recover, Reuse, Recycle
9
Shelter the World
9
Biosphere, Atmosphere, and Human Fears
8
Food
8
Security
8
Sustainability
6
Water
5
Power the World
4
Energy
3