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The ecosystem
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Transcript

  • 1. Prepared by- Kajri Patel
  • 2. The Ecosystem The interrelationships between all living things and the environment. Emphasis is on interdependence of all things. People, nature, and the earth form a delicately balanced system. Ozone is a rare form of oxygen that is poisonous to human beings at ground level but is necessary in the upper atmosphere to absorb the deadly ultraviolet radiation of the sun.
  • 3. Environmental Pollution Pollution is the harmful alteration of our environment by our own actions. Pollutants – either unwanted by- products or our activities or the obnoxious residues of things we have made, used, and thrown away. Air Pollution Water Pollution Land Pollution Global Warming Noise Pollution Aesthetic Damage
  • 4. Types of Pollution Air pollution  Most air pollution is caused by the burning of fossil fuels. Water pollution  Organic sewage  Eutrophication  Infectious agents  Organic chemicals  Inorganic and miscellaneous chemicals  Sediments from land corrosion  Radioactive substances  Waste heat from power plants and industry
  • 5.  Pesticides – chemicals used to kill insects defined as pests.  Herbicides – chemicals used to kill plant life, particularly weeds.  Chemical wastes  Radioactive fallout  Acid rain  Garbage Global warming  Since the late 1800’s the average global surface temperature has increased about 0.75 degrees C.  Most warming has occurred since 1950.
  • 6. Environmental Depletion The Dwindling Natural Resources  No nation is self-sufficient in the modern world. Energy Production and Consumption  Energy consumption per capita is higher in the United States than it is in any other country in the world.  Consumption is growing more rapidly than production.
  • 7. Environmental Pollution Problems Enforcement of air pollution standards has been reducing the amount of pollutants released into the air. In 2002, 34.3% of children under the age of 18 lived in an area that did not meet one or more of the air quality standards. Sick building syndrome. Presence of radon gas Electromagnetic radiation In 2000, 39% of rivers and streams; 45% of lakes, reservoirs, and ponds; 78% of the Great Lakes shoreline; and 14% of ocean shoreline were polluted.
  • 8. The Physical Threat Air pollution can cause or contribute to:  Permanent lung damage in children  Fetal deaths  Infant mortality  Respiratory illness  Cardiovascular disease  Skin problems, ulcers, and liver and kidney damage  Premature deaths  Asthma attacks  Lung cancer
  • 9.  Exposure to toxic materials can also lead to sterility The depleted ozone layer raises the risk of skin cancer
  • 10. Threat to the Ecological Balance A number of species of animals and plants have disappeared. People depend on biological diversity for the quality of their lives. Photosynthesis – a natural process essential to life, resulting in the production of oxygen and organic materials. Urbanization – the increasing concentration of people living in cities.
  • 11. Thank You