The document discusses how human activities negatively impact the natural environment. It provides background on key terms like environment, biosphere, ecosystem, and ecological footprint. It then examines several human impacts like population growth, industrialization, urbanization, agriculture, deforestation, desertification, land degradation, and various forms of pollution. Climate change issues from greenhouse gas emissions are also covered, along with terms like global warming and the carbon footprint. Overall, the document analyzes how unsustainable human resource use, pollution, and other activities threaten global ecological integrity and stability.

1. Impact of Human Activities on the Natural Environment Presented by Dr. B. Victor

4. Environment Environment Abiotic environment Sun light,soil,air,water Biotic environment Microorganisms,plants,animals

8. The quality of Human life is directly related to the quality of Environment. A healthy environment is essential to human survival. Water, air and soil pollution causes 40 per cent of deaths of the world.

11. Human wants are never ending N E E D S W A N T S W A N T S Environment

12. " Overshoot is growth beyond carrying capacity. The earth is constantly changing.

18. Human activity = Impacts Ozone depletion Loss of biodiversity Population increase Economic growth Global warming Air ,water & land pollution Resource depletion

33. Drivers of Environmental change Core values Amplifiers Consumptive behavior Drivers of Environmental change Anthropocentrism Human –centered values- Contempocentrism Generation – centered values- Technology Population growth Poverty Affluence

35. How do human impact the Environment? A multiplicity of effects

38. Human population growth

39. Impact of Population Growth Deforestation Over exploitation of Bioresources Pollution Rapid mining of non-biological resources

41. Impact of over population

42. Impact of Industrialization I N D U S T R Y Chemical inputs (raw materials Power inputs ( gas, oil, coal) Other inputs (water) Air Pollution Water Pollution Land Pollution The products Gaseous effluent Liquid effluent Solid Waste

43. Small Population and Little Technology - Society has low impact on Environment Society Deplete Pollute Environment Traditional Economics Resources/ Raw materials Environmental pollutants

44. Large Population and Increased Technology - Society has great impact on Environment Society Deplete Pollute Environment Environmental Economics Resources/ Raw materials Environmental pollutants

45. Industrial pollution Chemical industry Energy Emissions Chemical Products Chemical by-products Feed Chemicals

48. Impact of Industrialization Waste gases Industrialization Waste waters Hazardous wastes Complexity of wastes Toxic, carcinogenic cumulative and synergistic chemicals

50. Impact of Urbanization Urbanization Over crowding of people Increased demand for resources Increased disposal of waste Air pollution slums

53. Impact of Agriculture Agriculture Desertification Salinization & water logging Nitrate build-up Animal Wastes Fertilizer run-off (salts & phosphates) Pesticidal toxicity

62. Environmental Pollution

63. Pollution : A silent Killer People are exposed to harmful Pollutants in the air they breathe , the liquids they drink, the food they eat, the surface they touch, and the products they use. When the environment can not process the load of pollutants , pollution takes place . Every environmental system has a carrying capacity .

67. Rise in Carbon dioxide Level

71. Heat - trapping gases - Greenhouse gases (GHGs) GHGs carbon dioxide Nitrous oxide Methane Water vapour Halons (halocarbons) Fire-extinguisher Chlorofluorocarbons (e.g. Freon) A refrigerant

72. Greenhouse gases

77. Global Temperature rise

80. Sea level rise

82. Ozone hole size changes

83. Impact of Bad Ozone Bad Ozone Unpleasant appearance in urban cities e.g. photochemical smog Deterioration synthetic rubber, textiles, paints Leaf damage Reducing crop yields and forest growth Chlorophyll damage Discoloration

85. Acid rain

92. Health impacts of water pollution Water related Diseases Water – borne infections -typhoid, cholera, hepatitis Water – washed infections scabies , conjunctivitis, diarrhea Water – based infections Schistosomiasis,guinea worm Water – related insect vectors Yellow fever, sleeping sickness Defective sanitation -Hook worm

94. Health effects of pollution-Over view

96. Threats to Biodiversity Threats to Biodiversity Habitat loss and destruction Alterations in ecosystem composition Introduction of exotic species Over-exploitation pollution and contamination Global climate change

97. Links between climate change and biodiversity

103. Future predictions

106. Solving Environmental Problems

108. Green Technologies

109. Green Technologies

111. It’s your Environment

112. “ There is enough in the world for everyone’s need, but not enough for everyone’s greed.” - Mahatma Gandhi

113. If you want to be healthy , take care of the environment.

114. It’s our responsibility to save environment

115. Thank you for listening