C ENV 110 Lecture Notes - Lecture 20: Climate Change Mitigation, Agroecology, Polyculture

• School: UW
• Department: College of the Environment
• Course: C ENV 110
• Professor: Ray Hilborn

Document Summary

C env 110 lecture 20 biodiversity land sparing vs. land sharing video lectures. We already produce enough food to feed the world. About 30-50% of the food is thrown away. A lot of the food also goes to biofuel production --> cars. Land grabbing: international investors are increasingly leasing or buying farmland for food and fuel production. The global food production system right now is not feeing people. Diverse agroecological systems maintain functional biodiversity and ecosystem services, while increasing resilience and minimizing environmental costs. Biodiversity and ecosystem services: yield, pest control, pollination, climate change mitigation and adaptation. Yields and intercropping systems: use of fertilizer trees in africa. Yield increased from 1. 3 ton/hectare to 3. 5 tons. Improved soil quality: some trees without using synthetic fertilizers also increased yield in zambia. Pest control: polycultures >>>>> monocultures, birds and bats protect cacao " Ants as predators: polyculture --> monoculture destroys different ecosystems for different animals, bad.