Showing posts with label Environmental-Engineering. Show all posts
Showing posts with label Environmental-Engineering. Show all posts

Tuesday, 19 February 2013

INTRODUCTION TO ENVIRONMENTAL STUDIES


INTRODUCTION TO ENVIRONMENTAL STUDIES

Definitions

The term environment is derived from a French word environner which means‘surrounding’. It refers to an aggregate of all conditions that affect the existence, growth, and welfare of an organism or a group of organisms.  The term may be defined in a number of ways.

Environment is the sum total of all social, economical, biological, physical, and chemical factors which constitute the surroundings of  humans, who are both creators and
moulders of the environment.
 
Environment is the sum total of influences which modify and determine the development of life and its associated characteristics.
Types of Environment
Natural Environment
It includes components such as air, water, soil, land,forest, wildlife,flora, fauna, etc
The natural environment on Earth is divided into the following four realms:
 
Mesosphere
Biosphere
Lithosphere
Hydrospher
Anthropogenic Environment
It includes components that have been introduced by human   beings depending on their needs and requirements.
Components of Environment
The components of environment are broadly
classified as abiotic and biotic components.
 
Abiotic or non-living components of environment include all the physical and chemical factors that influence living organisms. Examples of abiotic components are air, water, soil, rocks, etc.
 
Biotic or living components are the living components of environment and include microbes, plants, animals, and human beings.
 
Environmental Studies
Environmental Studies refers to the study of the environment. It is not restricted to the point of view of one particular discipline but involves all disciplines that may affect the environment in any possible way. It involves the study and understanding of the fact that even a single phenomenon can affect the environment in a variety of ways with varying degrees of complexity, and each of these effects can be understood from different perspectives rooted in different disciplines.
Scope of Environmental Studies
Ecosystem structure and function
Natural resource conservation
Environmental pollution control
Environmental management
Environmental impact assessment
Research and development
Social development
Forest management
Environmental consulting firms
Environmental journalism
Environmentalists
 
Importance of Environmental Studies
Environmental Studies is useful in checking environmental pollution
It helps in maintaining ecological balance.
•It helps to gain skills to assess the environmental impact of  human activities.
It gives us basic knowledge of environment and associated problems.
It helps to achieve sustainable development
It helps to educate people regarding their duties towards the protection of environment.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Biodiversity


Biodiversity

The variety or variability of organisms and ecosystem is referred to as biodiversity. 
The existence of million of plants, animals, and micro-organisms, their genetic backgrounds, and the complex ecosystems to which they belong show the immense biodiversity present in the biosphere.
Types of Biodiversity
Genetic diversity - Diversity of genes within a species, i.e., genetic variability among the populations and the individuals of the same species.
Species diversity- Diversity among species in an ecosystem. ‘Biodiversity hotspots’  are excellent examples of species diversity.
Ecosystem diversity- Diversity at a higher level of organization, i.e., the ecosystem. It concerns the variety of ecosystems on Earth.
Value of  Biodiversity
Survival
Health and healing
Food security
Productive value
Ethical value
Aesthetic pleasure
Ecological services
Hotspots of Biodiversity
Hotspots are the richest and the most threatened reservoirs of plant and animal life on earth.
Hotspots are classified on the basis of three criteria :
The number of species present
The number of those species that exist exclusively in the given                                                      ecosystem
The degree of threat they face
Endangered Species
The species which are at the verge of extinction are known as endangered species. For example
Asiatic elephant
Great Indian Rhino
Endemic Species
The species which are confined to a particular region are known as endemic species.
These species remain limited in their distribution because of certain geographical barriers, such as sea, valley, mountain, etc.
Threats to Biodiversity
Unplanned development and habitat destruction
Poaching
Environmental pollution
Global climate change
Invasion by introduced species
Nature of legal systems
Mining
Exploitation of water resources
Eutrophication
Waste disposal
Conservation of Biodiversity
In situ Conservation
National parks
Wildlife sanctuaries
Biosphere reserves
Ex situ Conservation
Gene banks
Botanical gardens
Aquaria
Tissue culture technique
DNA technology
Biodiversity at Global  Level
On the Basis of  Vegetation
Arctic  Zone
Northern Temperate  Zone
South Temperate Zone
Tropical  Zone
On the Basis of  Fauna
 
Oriental Region
Australian Region
Neotropical Region
Nearctic Region
Paleartic Region
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 




 
 

 

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