Pollution Water

WATER POLLUTION USUALLY describes the introduction or presence of harmful or objectionable substance in water in magnitude sufficient to alter the quality indices of natural water. It also connotes the presence of polluting substances in rivers, lakes, bays, seas, streams, underground water, or oceans in levels capable of resulting in measurable degradation of the water quality or usefulness. For example, if water contains too much contamination as a result of certain harmful chemical compounds or microorganisms, it could be rendered unsafe in its existing state for an intended purpose. This could be described as water pollution. In most cases, water pollution may arise from the use to which the water has been put. Although some kind of water pollution can occur through natural processes, it is mostly caused by human activities.

Water pollution has many sources and characteristics. These sources can be categorized into point and nonpoint sources. Point sources of water pollution are direct discharges to a single point, or simply stationary location discharges. Examples include discharges from sewage treatment plants, power plants, factories, ships, injection wells, and some manufacturing or industrial sources. Nonpoint sources of water pollution are more diffused across a broad area and their contamination is traceable to a single discharge point. Examples of nonpoint sources include mining activities and agricultural and urban runoffs. Water pollution arising from nonpoint sources accounts for the majority of contaminants in streams, rivers, bays, underground water, and seas.

A water pollutant is any biological, chemical, or physical substance if when present in water at excessive concentrations has the capability of altering the chemical, physical, biological, and radiological integrity of water, thereby reducing its usefulness to living organisms, including man. Although there are many sources of pollutants in our waters, the primary sources of water-polluting substances come from sewage, agricultural runoffs, oil spills, industrial wastewaters, land drainage, and domestic wastes. The major categories of common water pollutants include heavy metals, pathogens, nutrients, acids, organic chemicals, and radioactivity. Many of these substances are toxic and are capable of interacting additively or synergistically or antagonistically to give varying responses in aquatic ecosystems and in humans. However, the influence of a pollutant in natural waters varies according to the polluting substance, the local environmental conditions, and the organism involved.

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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