Human impact on environment

Photographer and Teacher em Photo Expressions
3 de Nov de 2014

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Human impact on environment

  2. Remember that… “Ecology” Is the study of the interactions of organisms w/ its environment.
  3. Ecology of Populations
  4. Humans are part of the Earth's Ecosystem. Human activities can either deliberately or inadvertently alter the balance of an ecosystem.
  5. What do you Think? How do human activities affect the environment?
  6. With more info… Will you change your perspective or will you feel the same way?
  7. Human impacts on the Environment Global warming Use of machinery by humans seems to be increasing CO2 levels in the air. CO2 prevents heat from escaping, causes slight world wide temperature increases. Rising water temperatures causes coral bleaching
  8. Human impacts on the environment Deforestation • Caused by demand for wood products, need for space, farmland, housing, roads. •Deforestation causes habitat fragmentation. •Animals and plants are forced into confined areas.
  9. Human impacts on the Environment Ozone depletion •Caused by aerosol chemicals called chlorofluorocarbons (CFCs). •CFC’s Escape into atmosphere, reacts breaking down the ozone (O3, a protective atmospheric layer). •UV rays penetrate the atmosphere and cause harm to many organisms.
  10. “HOLE” in the ozone (O3)
  11. Human impacts on the Environment Fishing activities •Large demand for fish and shellfish. •Commercial Fishing can be harmful to environment in many ways.
  12. Human impacts on the environment Invasive species (EXOTIC SPECIES) introduced by people accidentally or intentionally can cause problems if no natural enemies are present. Cane toad was introduced in Sonora to control cane beetles, and other insects that destroy sugar cane crops.
  13. Exotic pet trade • Capture and sell wild animals from exotic locations. • Wealthy buyers and collectors desire illegal animals. • Animals removed from their habitat causes an imbalance in the ecosystem. Human impacts on the Environment
  14.  Manure – Environmental Effect:  decomposers increase rapidly due to sufficient food supply  O2 content in water decreases  cause suffocation of fish & other organisms
  15. Agriculture wastes  Inorganic Fertilizers – Environmental Effect:  cause rapid growth of algae (e.g. red tides)  use up lots of O2 in water  fish & other organisms die from suffocation Human impacts on the Environment
  16. Industrial WastesIndustrial Wastes Soluble Poisonous Heavy Metal Elements – Environmental Effect: accumulate along the food chain & cause death when in high concentration
  17. NoiseNoise  Sources • domestic • industrial • constructional • traffic  Effects: Health Effect: causes psychological stress, irritation, nervous fatigue, ear less sensitive & even deafness
  18. Importance of the Environment • Organisms depend upon one another and interfering with one Organism can have a big effect w/in the habitat
  19. Natural resources: Non-renewable includes fossil fuels (petroleum, coal) • Renewable includes animals, plants, water, wind, etc. • Even renewable resources can run out . Importance of the Environment
  20. Importance of the Environment Natural resources Renewable energy sources include wind power, geothermal energy, ocean currents.
  21. Why we need Conservation ?Why we need Conservation ? Rapid growth of population has led to increase in demand for land & thus destruction of natural habitat.
  22. ConservationConservation Can be achieved with: • wise use of natural resources, • least disturbance to the environment and • Will give good quality of life to man.
  23. Ways of DOING ConservationWays of DOING Conservation Recycling of Used Materials • e.g. recycle paper & aluminum cans Economical Use of Natural Resources • e.g. develop other energy sources like solar energy & nuclear energy Pollution Control • e.g.  content of lead & sulphur in petrol • e.g. install catalytic converter in motor cars • e.g. sewage treatment
  24. Sewage TreatmentSewage Treatment  Sedimentation • settle down solid substances to form sludge  Decomposition • aerobic respiration of microorganisms in aeration tank by bubbling air in order to oxidize organic compounds into inorganic compounds
  25. • Legislation • control the amount of pollutants discharged • Education • by mass media (besides normal schooling) Ways of ConservingWays of Conserving