these slides describes the impacts on environment by human, human activities which caused impacts on biodiversity and the steps to prevent the ozone layer, pollution caused by human

1. HUMAN IMPACT ON ENVIRONMENT
PRESENTED BY
DR.N.SANTHAMANI
ASSISTANT PROFESSOR IN
ECONOMICS
GOVERNMENT ARTS COLLEGE
COIMBATORE-18

2. WHAT IS
ENVIRONMENT ?
Environment is everything that is around us. It can
be living (biotic) or non-living (abiotic) things.
It includes physical, chemical and other natural
forces. Living things live in their environment.
In the environment there are different interactions
between animals, plants, soil and water and other
living and non-living things.

4. HUMAN IMPACT ON
ENVIRONMENT
Human activities that cause damage (either
directly or indirectly) to the environment on a
global scale include human reproduction,
overconsumption, overexploitation, pollution,
and deforestation, to name but a few.

5. Human Impact has caused:
Pollution – Land; Air and Water which includes
Freshwater Creeks and Rivers, Seas and Oceans.
Deforestation and Destruction of Habitats
Endangerment and Extinction of Flora and
Fauna Species
Oil spill from ships

6. HUMAN ACTIVITIES:
Irrigation.
The environmental impact of irrigation includes the changes in quantity and
quality of soil and water as a result of irrigation

7. Intensive agriculture and excessive use of fertilizers and pesticides are
destroying the natural land and driving animals away

8. Soil Erosion.
Runoff on bare land leads to erosion. Grass, trees, and other plants hold
the soil in place and avoid erosion. The highest rates of erosion are
produced in urban areas during construction.

9. Deforestation.
Increasing population, industrialization and need of land for development
of expanding cities has led man to cut down forests selfishly.

10. Sea Pollution - the Primary Culprits

11. Water Pollution.
Sewers and drains, carry domestic and industrial wastes
that might have been widely deposited on the soil, but
have been channeled into rivers and other bodies of water.
The sanitary sewer system carries sewage from
residential, commercial , and industrial sources to the
waste water treatment plant.
At a waste water treatment plant most harmful
substances are removedfrom sewage before it is piped to a
nearby body of water .

12. Solid Waste.
Incineration produces air pollution, while landfills
give off gases that contribute to Global Warming,
and pollute underground water supplies. Landfills
provide a ready dumping ground for non-
hazardous waste.
Some landfills create their own problems. For
example, older ones have no lining andwastes can
filter down through the soil and into the water
supply.

13. The ocean floors are also being affected because of the vast bulk of
waste material that humans are creating.

14. Industrial Pollution.
Industrial pollution is generally referred to the undesirable
outcome when factories emits harmful by-products and waste into
the environment such as emissions to air or water bodies (water
pollution), deposition on landfills etc (land pollution) or emission of
toxic chemicals into the atmosphere (air pollution)

15. INDUSTRIAL POLLUTION

16. Mining.
The environmental impact of mining includes erosion, formation of sinkholes,
loss of biodiversity, and contamination of soil, groundwater and surface water
by chemicals from mining processes.
Environmental impact of mining.

17. War.
As well as the cost to human life and society, there is a significant
environmental impact of war with modern technology war can cause
a far greater devastation on the environment.

18. Energy industry
The environmental impact of energy harvesting and consumption is
diverse. In recent years there has been a trend towards the increased
commercialization of various renewable energy sources
Coal mining and burning.

19. IMPACT OF HUMAN ACTIVITIES
Depletion of Ozone Layer.
Scientists then discovered a “hole” in the ozone
layer over the Antarctic in the 1980s.
Initially, concern for the ozone focused on
chemicals known as chlorofluorocarbons (CFCs).
Later, halons, carbon tetrachloride (CTC), methyl
bromide and hydro chlorofluorocarbons (HCFCs)
were targeted.

21. Carbon footprint is a measure of the impact human
activities have on the environment in terms of the
amount of greenhouse gases produced, measured
in units of carbon dioxide

22. Earthquakes are seen as something outside of human control, but there is
evidence that human activity can trigger minor events and at least one
major event. During the underground nuclear testing in Alaska on Amchitka
Island, of the Aleutians, USA, an underground test triggered a massive
earthquake that also triggered a small tsunami.

23. Impact on Biodiversity.
Human activities are causing major changes in biological
communities worldwide, and these changes can harm
biodiversity and ecosystem function.
Ecosystem function is important for supporting plant
and animal communities, and ensuring the long-term
survival of human populations.

24. The main threats facing biodiversity globally are:
destruction, degradation and fragmentation
of habitats
reduction of individual survival and
reproductive rates through exploitation, pollution
and introduction of alien species.

25. PREVENTION:
Switch to Renewable Energy sources not based
on fossil or nuclear fuels like direct or indirect
use of solar energy, wind, tidal, geothermal,
wood and other biomass.

26. CONCLUSION:
Fortunately, man is learning that there are activities he can
undertake to improve land he has already degraded. This may involve:.
 Removal of pollutant materials.
 Minimize the magnitude of pollution
 Conserve non-renewable resources
 Conserve ecological systems
 Develop and utilize cleaner technologies
 Maximize recycling of materials and waste