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Part 4: Human Impacts

Part 4: Human Impacts. Human’s Impacts on Environment. 1. Cause of human’s impacts 2. Global changes 3. Biodiversity loss. Human consumption caused environmental problems. Water consumption Land use demand Energy consumption Food production. World Water Supply.

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Part 4: Human Impacts

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  1. Part 4: Human Impacts Gajaseni(BBA)

  2. Human’s Impacts on Environment 1. Cause of human’s impacts 2. Global changes 3. Biodiversity loss Gajaseni(BBA)

  3. Human consumption caused environmental problems • Water consumption • Land use demand • Energy consumption • Food production Gajaseni(BBA)

  4. World Water Supply • Water available for human use • Freshwater = 3% of total water on earth • Only 0.003% readily available freshwater Gajaseni(BBA)

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  8. Water withdrawal by use • Domestic purpose = 8% • Industrial purpose = 23% • Agricultural purpose = 69% Gajaseni(BBA)

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  13. Using dams to supply more water: • To capture an store water from rain and melting snow • To produce hydroelectric power • To provide water for irrigation • To improve flood control system • To provide recreational activities Gajaseni(BBA)

  14. Disadvantages of dams: • Loss of water through evaporation • Cause of earthquake • Ecological biodiversity loss • Disruption of fish migration • Reduction of nutrient-rich silt to river mouth Gajaseni(BBA)

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  16. Land use demand • Land on earth • 51% not usable land • 21% usable land • 28% potential usable for cropland and grazing land Gajaseni(BBA)

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  18. Agriculture practices caused the increase of land use demand. • Urbanisation increased the rate of land use change. Gajaseni(BBA)

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  20. Energy consumption • Non-renewable energy • Fossil fuels, natural gas, coal Gajaseni(BBA)

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  35. Renewable energy • Solar energy • Active solar heating system • to absorb solar energy and be used directly and the rest can be stored in insulated tanks • Passive solar heating system • to capture sunlight directly within a structure and converts it into low-temp heat for space heating Gajaseni(BBA)

  36. Solar cell electricity generating • Photovoltaic panels on roof • Sunlight creates an direct current (DC) electric current and can be stored in battery • DC electricity needs to convert to alternating current (AC). Gajaseni(BBA)

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  38. Geothermal energy from earth’s mantle can be used • for space heating • to produce electricity or high-temp heat for industrial processes. Gajaseni(BBA)

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  40. Wind energy • The use of wind to produce electricity in the potential area • The wind farms emit no heat trapping CO2 or other air pollutants and no need water cooling. Gajaseni(BBA)

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  42. Biomass energy is an advisable energy option. • 14% of the world’s energy • 35% of the energy used in developing countries for domestic consumption (heating and cooking) • Solid biomass • Liquid or gaseous biofuels Gajaseni(BBA)

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  44. Food production • Fish production • 70% of fish catch from ocean • 1/3 of the world fish harvest is not consumed directly by humans and is used as animal feed, fish meal and oils. • Grain production • Rice, wheat and corn are major grain for 2/3 world population. Gajaseni(BBA)

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  47. Livestock production • Meat production increased 29% from 1950-1996. • Meat-based diet of people in developed and developing countries has effects on resource use, environmental degradation, pollution and disease. Gajaseni(BBA)

  48. Cause of human’s impacts • Deforestation • Over harvesting • Over consumption • Low efficient food production • Unsustainable technology Gajaseni(BBA)

  49. Conclusions • What should human do for the future? • Reduce human population • Change of consumer behaviour • Reduce environmental problems Gajaseni(BBA)

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