dealing with environmental concerns
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DEALING WITH ENVIRONMENTAL
Threats to environment
Extinction Loss of habitat Degradation of environment Pollution Climate change
extinction Extinction takes place when the last
number of a species dies. Extinction of species may come
suddenly when an otherwise healthy species is wiped out completely due to toxic pollution .
It is estimated that over 99.9% of all species that ever lived are extinct.
The average span of most of the species is 10 millions years.
Causes of extinction Habitat degradation – the main cause of
habitat degradation world wide is agriculture with urban sprawl, logging, mining, and certain fishing and hunting practices.
Physical destruction: for e g, destruction of ocean floors by bottom fishing .
Vital resources including water and food can be limited during habitat degradation ,leading to extinction of some species.
Loss of habitat Habitats are the place where the
organisms live. Habitat is the natural home or
environment of animals ,plants ,or other organisms.
Habitat loss is the loss area or natural place of an organism.
It is due to destruction ,fragmentation or degradation of habitat .
Three major kinds of habitat loss
Causes of loss of habitat Agriculture . Land conversion for
development. Water development . Pollution. Global warming.
Degradation of environment Environmental degradation is the
deterioration of the environment through depletion of resources such as air ,water, and soil the destruction of ecosystems and the extinction of wildlife.
It can occur naturally or through human process.
E g. ozone depletion ,destruction of marine environment .
Causes of environmental degradation
Industrial activities Population explosion Farm mechanization Pesticides and insecticides Felling of trees Urbanization and changing
lifestyles Development projects Natural causes
Impact of environment degradation
Ozone depletion Acid rain Depletion of marine life Loss of forests Pollution of ground water Soil erosion Air pollution Desertification Global warming
Pollution Pollution refers to the act of
contaminating the environment by introducing certain hazardous elements that disturbs ecosystem and directly or indirectly affects the living organisms.
Types of pollution.
EFFECTS OF AIR POLLUTION.
Reduced lungs functioning. Irritation of eyes, nose ,mouth and
throat . Asthma attacks Headaches and dizziness Cancer Premature death Cardiovascular problems Reduced energy levels
EFFECTS OF WATER
POLLUTION Water borne diseases Damage to DNA Liver and kidney problem Hormonal problems Cancer
Effects of noise pollution
Decreases the efficiency of a man Lack of concentration Fatigue Causes of blood pressure Temporary or permanent deafness
Effects of soil pollution Can alter metabolism of micro
organism and arthtropods in a given soil environment
Disturbance in food chain. Negative effect on predator animal
species Animal extinction
Climate change The earth’s climate has changed
throughout history There is increasing occurrence of
floods , famines , storms, hurricanes, and so on
Biggest climate change is greenhouse gases which results in global warming.
Gases of green house
Carbon dioxide Methane Chlorofluorocarbons (CFCs) Sulfur dioxide Nitrous oxide
Effects of climate change
Rise in sea level Rise in global temperature Warming oceans Shrinking ice sheets Declining arctic sea ice Glacial retreat Ocean acidification
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