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Environmental Studies:
Air pollution:

Human Influences:
Pollution-Upsetting balance in natural ecosystems in these elements:
Air
Water
Land

Air pollution: (Abiotic Factors)
Made up of: Oxygen (21%)
Nitrogen (78%)
Air pollutants are made up of gases, liquids and solids in the atmosphere.
Chemicals that are released into the atmosphere:
1. Natural:…

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(Smoke, spores, sulfuric acid)

Green house effect and global warming:
Increased temperature - change in climatic conditions.

Causes:
Flooding: polar ice caps melt.
Salinized water: rising oceans wash inland, fresh water tables become
salinized and therefore is undrinkable.
Air pressure changes: effect rainfall patterns, winds, storms = natural
disasters.
Leaching…

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Rays are partly absorbed by ground. (Earth warmed)
LONGWAVE given off from earth ­ become trapped in
atmosphere then reflected back to earth.
Therefore atmosphere heats = green house effect.
Enhanced green house effect- increase in earth's temperature = global
warming.
These increased temperatures bring dramatic changes in our climate.…

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Reduce oxygen levels
Increase carbon dioxide levels, therefore an increase in global warming
Change in the weather patterns (rainfall and wind)
Weakening the immune system (increasing spread of infectious disease)

Acid rain:
Invisible, highly destructive, dangerous
Caused by release of sulphur dioxide and nitrous oxide
Reactions speeded up by sunlight.…

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Page 6

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Environmental Studies:
Water pollution:

Water pollution:
3400 per person a day
River and underground water (aquifers)- two main fresh water sources
Alters physical state of water
(Increased temperature)
Causes:
Toxins in waterways from agriculture and industry
Pathogens in sewage
Eutrophication ­ accelerated
Pollutants discharged into the sea
And washing in…

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What happens to sewage?
Treated first. (Settlement tanks)- then treat in many ways. Activated
sludge method ­ produces methane (used as fuel) and sludge (used as
fertilizer).
All methods rely on micro-organisms to decompose organic matter to
simple harmless substances.
What about developing countries?
No ways of treating therefore pollutes…

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It contaminates soil
Poisons underground water with excessive release of sulfates and heavy
metals
Releases pollutants into air
Impacts cultural and visual environment
Rehabilitate mine areas when closed down.

Read acid mine drainage*

Measuring water pollution:
Measured by how much the pollutants deplete oxygen levels in to
water- biochemical oxygen…

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