Miss Vanessa Parra

HUMAN IMPACT ON ENVIRONMENT

Remember that…

“Ecology” Is the study of the

interactions of organisms w/ its

environment.

Ecology of Populations

Humans are part of the Earth's

Ecosystem.

Human activities

can either deliberately or

inadvertently

alter the balance

of an ecosystem.  

What do you Think?

How do human activities affect

the environment?

With more info…

Will you change your perspective or will you feel the same way?

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

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.

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.

“HOLE” in the ozone (O3)

Human impacts on the Environment

Fishing activities•Large demand for fish and shellfish.

•Commercial Fishing can be harmful to environment in many ways.

Human impacts on the environmentInvasive 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.

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

Manure– Environmental Effect: decomposers increase rapidly due to sufficient

food supply O2 content in water decreases cause suffocation of fish & other organisms

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

Industrial WastesIndustrial Wastes

Soluble Poisonous Heavy Metal Elements

– Environmental Effect: accumulate along the food chain & cause death when in high concentration

NoiseNoise

Sources

• domestic

• industrial

• constructional

• traffic

Effects:Health Effect: causes psychological stress, irritation,

nervous fatigue, ear less sensitive & even deafness

Importance of the Environment

• Organisms depend upon one another and interfering with one Organism can have a big effect w/in the habitat

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

Importance of the Environment

Natural resources

Renewable energy sources include wind power, geothermal energy, ocean currents.

Why we need Why we need Conservation ?Conservation ?

Rapid growth of population has led to increase in demand for

land & thus destruction of natural habitat.

ConservationConservation

Can be achieved with:

• wise use of natural resources,

• least disturbance to the environment and

• Will give good quality of life to man.

Ways of DOING Ways of DOING ConservationConservation

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

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

• Legislation

• control the amount of pollutants discharged

• Education

• by mass media (besides normal schooling)

Ways of ConservingWays of Conserving