Water Pollution and Global Warming

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Assignment on “Water Pollution & Global Warming”

Course : Introduction to Public Health Course Code : PBH 101

Prepared for Dr. Maleeha Azeem (MeA) Course Instructor North South University

Prepared by Kazi Nazrul Islam Id : 1010275 030 Sec : 01

Date of Submission : 20 November, 2011

PBH 101

[ASSIGNMENT ON WATER POLLUTION & GLOBAL WARMING]

Table of Contents: Index Contents 1.0 Water Pollution 1.1 Introduction 1.2 Sources of Water Pollution 1.3 Common Contaminants 1.4 Health Hazards Caused by Water Pollution 2.0 Global Warming 2.1 What is Global Warming 2.2 Causes of Global Warming 2.3 Consequences of Global Warming 3.0 Reference Page no. 03 04 09 10

11 12 15 18

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PBH 101

[ASSIGNMENT ON WATER POLLUTION & GLOBAL WARMING]

1.0 Water Pollution 1.1 Introduction : Water is a vital natural resource which is essential for a multiplicity of purposes. We use water in many purposes. Likes drinking and other domestic uses, industrial cooling, power generation, agriculture (irrigation), transportation and waste disposal. In the chemical process industry, water is used as a reaction medium, a solvent, a scrubbing medium, and a heat transfer agent. As a source of life for man, plants and other forms of life it cannot be replaced. Water is essential for maintaining ecological systems necessary for the survival of humans. As a result it plays important roles in ecosystem support, economic development, cultural values and community well-being. Dozens of times a day those of us who live in the industrialized nations of the world enjoy a blessing denied to 75 percent of the world population: abundant supplies of clean water. But water is essential for life on earth. No known organisms can live without it. For centuries water has been used as a dumping ground for human sewage and industrial wastes. Added to them are the materials leached out and transported from land by water percolating through the soil and running off its surface to aquatic ecosystems. Water pollution is degradation of water quality. Any physical, chemical, or biological change in water quality that adversely affects living organisms or makes water unsuitable for desired use can be considered pollution. Thus the term water pollution refers to – “Water contamination by a variety of chemical substances or eutrophication caused by several nutrients and fertilizers.” - Southwick, 1976 U.S. Department of Health Education and Welfare defines water pollution as – "The adding to water of any substance or the changing of water's physical and chemical characteristics in any way which interferes with its use of legitimate purposes". At present, water pollution is a major global problem. Everyday many people are dying for water pollution. Now water pollution becomes the leading cause of death & diseases.

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PBH 101

[ASSIGNMENT ON WATER POLLUTION & GLOBAL WARMING]

1.2 Sources of Water Pollution : There are many sources of water pollution. But before knowing that, we need to know that what are the sources of water, and then we will understand how they are becoming polluted. We get water from two sources – Surface Water Ground Water Surface Water is fresh water found on Earth’s surface in streams and rivers, lakes, ponds, reservoirs. Surface waters are replenished by the runoff of precipitation from the land and are therefore considered a renewable, although finite resource. Ground Water refers to the fresh water under Earth’s surface that is stored in aquifers. This water originates as rain or melting snow that seeps into the soil and finds its way down through cracks and spaces in sand, gravel or rock until it is stopped by an impenetrable layer, there it accumulates as groundwater. Surface water and groundwater have often been studied and managed as separate resources, although they are interrelated. Surface water seeps through the soil and becomes groundwater. Conversely, groundwater can also feed surface water sources. Sources of surface...
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