Living things face a constant barrage of external stresses or threats that Chalan ge their ability to survive and reproduce. If a species is unable to successfully cope with these threats through adaptation, they may face extinction.
A constantly changing physical environment requires organism to adapt to new temperature, climate and atmosphere condition. Living things must also deal with unexpected events such as volcanic eruptions, earthquake, meteor strikes, fires and hurricanes.
A new lifeforms arise and interact, species are further challenged to adapt to one another to deal with competition,predation,parasitism,diseases and other complex biotic processes.
In recent evaluationery history, threats facing many animals and other organisms have been driven primarily by the effect of single species: humans. The extent to which humans have altered this planet have affected countless species.
Preventable threats :
Since man is indeed parts of nature, man-made threats are marely a subset of natural threats. But unlike other threats. Man-made threats are threats that we prevent by changing our behaviour.
As humans, we have a unique ability to understand the consequences of our actions,both present and past. We are capable of learning more about the effects our actions have on the world around us and how changes in those actions could help to alter future events.
The types of man-made threats :
Mangmade threats can be classified into following categories :
Habit destruction & fragmentation :
The destruction or splitting up of once continuous habitat to enable humans to use the land for agriculture, development of towns and cities, construction of dams or other purposes.
Climate change :
Human activities such as burning of fossil fuel, have altered the earthvs atmosphere and have resulted in globe climate changes.
Introduction of exotic species :
Accidental and intentional introduction of non-native species into regions never before occopiedby the species have resulted in the extinction of numerous endemic species.
Pollution :
Pollutents ( pesticides, herbicides, etc) released into the environment are ingested by a wide variety of organisms.
Over exploitation of resources :
Exploitatoon of wild populations for food has resulted in population crashes(over-fishing for example)
Accidental deaths :
Car hits, window collisions (birds), collisions with ships(whales).
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