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  • Energy use in agriculture
  • Planting to catch more sunlight
  • Biodigesters in ecological farming systems
  • Biogas in Uganda
  • Improving organic fertilizers
  • Saving energy with better tools
  • Biogas production with guinea pig manure
  • Improving traditional water mills
  • Clean energy for chilling milk
  • Passive solar architecture for mountain agriculture
  • Developing a solar dryer for coffee
  • Building silos to introduce healthier cookstoves in Honduras
  • Alternative energy and women in nural Nepal
  • Mama tree