Essay on environment for all types of exam 250, 500 and 1000+ words
ESSAY ON ENVIRONMENT
Environmental pollution refers to any physical, chemical or biological alteration in the quality of air, water or soil to a degree that is harmful to living organisms. Pollution, is thus, direct or indirect change in any component of the biosphere that is harmful to the living components and in particular undesirable for man.
The agents that produce the state of pollution are called pollutants. A pollutant may thus include any chemical or geochemical substance, biotic component or its product or physical factor that is released intentionally by man into the environment in such a concentration that may have adverse harmful or unpleasant effects.
A source is the origin of a pollutant: at this point it has just entered the environment. What is important is what it can do and how it moves through the environment starting with what the pollutant can do, i.e., its properties.
Leaving aside the specific chemical and physical properties there are eight things that are important:
- The persistence of the pollutant (the likelihood of it surviving in a state in which it can cause damage).
- The lifetime of the pollutant (how long it’s active for).
- Interactions (chemical or physical reactions with other substances). Here, one needs to distinguish between the primary pollutant one that has an effect unaltered and the secondary pollutant which comes through interactions with other pollutants or the environment.
- Speciation – The number of forms a pollutant can take. The greater the speciation the more ways it can react with the environment.
- Pollution loads – The amount of a pollutant that can be found in the environment. Two concepts are important: critical load (the amount of a pollutant that is needed before one can detect damage to an ecosystem) and target load – the amount of a pollutant that is permitted or tolerable. Target loads would change with changing knowledge or even public perception.
- Dispersion – The ease with which a pollutant would spread throughout the environment.
- The ability to bio accumulate – The ease with which a pollutant will stay in a target or environmental area and therefore build-up.
- Ease of control – How simple will the pollution problem be to clean up? A simple solid spill will be easy to remove, a liquid less so and gases almost impossible to contain. There are also hidden issues here. For example, when the first oil tanker disaster occurred in 1967 (the Torrey Canyon running aground off the Isles of Sicilly) it was thought that the spill would be easy to contain. Unfortunately, it didn’t burn and attempts to clean off oil with detergents created more problems than the oil did.
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2. ESSAY ON ENVIRONMENT 500 WORDS
ESSAY ON ENVIRONMENT