POL469H1 Lecture 10: Lecture 10.rtf
Document Summary
More living in cities than rural: 60% urban in 2030. Mega cities are growing in the developing nations. People don"t want to be in agricultural sector. Although there"s a rise in conventional agriculture, there is a loss of labour force. Desertification, poor land, degraded soils, mechanization, climate change induced drought. Costs and benefits of urban life and ecology. Poverty, unemployment, access to food and housing, waste disposal, pollution etc. 25% of urban third world population is dependent on food aid. Prone to risk due to settlement in vulnerable land. Lack of proper sewage treatment leads to health hazards. Water used as solvent to pick up waste. Organic waste lead to algae bloom, loss of fish. As it is being drained, the city is sinking. Located in the sthpz (air descending) on the city. Environmental services: flood control, erosion control, coastal wave action, root networks aggregate soils agriculture, aquaculture, fuel from peat. Landfill, altering upper watersheds, introduced species, exploitation, population irrigation.
