What exactly are causes of pollution?
Let's try to define the concept of pollution first.
Here is one classical definition by Wikipedia:
"Pollution is the introduction of contaminants into the environment that cause harm or discomfort to humans or other living organisms, or that damage the environment."
And here is another really good one:
“Any use of natural resources at a rate higher than nature's capacity to restore itself can result in pollution of air, water, and land.” (Ref. 2)
We can expand the second definition and conclude that pollution takes place because:
So it is not just the concepts of production & consumption but excessive production & consumption which are the major contributors to man-caused pollution.
To add to that, it is not only excessive production but also inefficient & dirty methods of production which become sources of environmental pollution.
And it is not only excessive consumption but also careless & thoughtless disposal of post-consumption waste resources which could otherwise be recycled.
Our analysis of causes of pollution focuses on:
Here is its schematic presentation:
We start the discussion with the fundamental drivers of pollution.
The humanity had known pollution, to some extent or another, at least since the times the fire had been invented.
But it was only with the onset of the industrial revolution in the 19th century that people realized the seriousness of the pollution problem and its often devastating effects.
In the last 200 years or so there appeared several fundamental trends which became the major forces behind the surge in levels of air, water & land pollution throughout the globe.
Industrialization is the first fundamental cause of pollution. Among other things, industrialization set in motion the widespread use of fossil fuels (oil, gas & coal) which are now the main sources of pollution.
Population growth is the second fundamental pollution cause. With population numbers literally exploding around the world, the demand for food and other goods goes up. This demand is met by expanded production and use of natural resources, which in turn leads to higher levels of pollution.
Globalization is another major cause of pollution. Globalization has become an effective facilitator of environmental degradation. Developing countries usually have much looser laws on environmental protection. With this “benefit” as well as the population growth and easy availability of cheap labor, big industry prefers to move its facilities to such “pollution havens” rather than work in more regulated markets.
So we won’t be wrong if we consider industrialization, population growth and globalization the fundamental drivers of pollution, the very roots of the gigantic pollution tree.
Taking a step down from the fundamental drivers, we can now approach production & consumption as primary & secondary causes of pollution.
We refer to PRODUCTION as the primary cause of pollution because the whole cycle of extracting and processing natural resources and then selling processed goods starts from this point. And it obviously comes before consumption.
The diagram to the left is a basic presentation of major sectors which comprise numerous polluting sub-sectors.
The production side of the diagram includes manufacturing industries, power generation, road, rail & air transport and agriculture & timber production. In reality, it can be of course broken down into many other industries / sub-industries.
So how does the production side contribute to global pollution?
Let's consider the following example.
A car is a necessity for many people who use it in their everyday lives. In order to produce cars, a car manufacturer needs to:
Raw materials are extracted from earth in large amounts often damaging the natural system of the area from which they were extracted, as well as surrounding areas, ex. rainforests.
Petroleum-based energy generation causes the emission of gases into the atmosphere and often contaminates water and land of the surrounding areas.
Cars are manufactured leaving behind an environmentally destructive footprint as described above.
That is a very simplified explanation of how manufacturing contributes to environmental pollution.
We'll now have a look at consumption.
We refer to CONSUMPTION as the secondary cause of pollution because this stage comes after, and depends on, production.
The consumption side of the diagram includes individual consumers as well as residential, commercial & social sectors which utilize the goods offered by the production side.
And how does the consumption side contribute to global pollution?
Let's continue with the example of the car. Each car owner needs to:
The burning of petrol causes the emission of dirty gases straight into the atmosphere. Such air pollution then travels globally affecting many different parts of the planet.
Car detergents are often made of harmful chemicals which, when used, are released directly into the environment, ex. via waste water.
A significant percentage of each tire's composite material comes from petroleum derivatives and other chemicals. Old tires often end up unrecycled and thrown into landfills releasing harmful chemicals onto surrounding land areas and into the air and thus contributing to air & land pollution.
Going back to the production side, the more often tires need to be changed, the more natural resources will need to be allocated yet again for their production and the more pollution will be released into the environment.
In-car pollution is caused by the offgassing of chemicals from freshly-produced car components. In this case, the health of new car owners suffers alongside the health of the wider environment.
That is another simplified explanation of how consumption becomes a significant cause of pollution.
So production and consumption are the basic causes of pollution.
If that is the case, then each industry / sector that "belongs" either to production or consumption becomes a source of pollution.
Let's look at pollution sources in more detail below.
When we think of pollution, the first thing that naturally comes to mind is manufacturing.
And that is no surprise. Images of enormous chimneys emitting heavy dirty fumes into the air are very powerful indeed, and are directly associated with pollution.
Manufacturing includes numerous industries which are in fact sources of all types of pollution - air, land and water.
We have grouped manufacturing industries into 5 large sectors, as you can see in the diagram below:
Manufacturing Sources of Pollution
So each of these sectors including their own sub-sectors is a source of pollution:
This classification aims to give us an idea of the "pollution's points of origin" from the manufacturing perspective. It is in no way an exhaustive list of polluting industries.
Power generation is another huge source of pollution which is nowadays associated with smoky chimneys even more than manufacturing.
The classical example here is the burning of fossil fuels to generate power. Carbon dioxide and other harmful gases are emitted in the process and cause serious ecological damage for many years to come.
Nuclear power is far from being a clean source of energy, even though its lobbyists may claim so. The toxic radioactive waste produced as a result of its generation takes thousands of years to decompose and become harmless. So don't fall for the lie of looking at nuclear as a "green" source of energy just because it doesn't emit greenhouse gases into the atmosphere.
So here are some major sources of pollution from the power-generation sector:
Public transport & shipping are also significant contributors to global pollution levels. All of them use fossil fuels for operation. Rail transport is probably the cleanest of all the types, and air transport is assumed to be one of the least efficient ones.
Sources of pollution by types of transportation:
The public often doesn't realize just how significant a source of pollution agriculture & timber production have become.
Livestock farming uses vast amounts of resources and produces a lot of waste. Harmful fertilizers are widely used to grow cereals and other plants - such chemicals affect negatively the wider environment as well as human health.
Timber production is a major cause of global deforestation which releases carbon dioxide into the atmosphere.
Sources of pollution from the agricultural sector:
While production sectors are obvious examples of "pollution creation", consumption presents a more subtle side to this issue.
When we look at individual consumers, a lot of pollution comes from landfill disposal of post-consumption waste which could actually be recycled. At the same time, there are many consumer goods which cannot be recycled - and they end up on the landfill as well.
As for the wider residential sector, domestic gas heating systems and private transport are no doubt some of the major contributors to global pollution. On top of that, many residential items which can or cannot be recycled (ex., domestic furniture) are also sent to landfills.
Sources of pollution by individual consumers and residential sector:
We have a similar situation with the commercial & social sectors. Any waste generated from the use of premises as well as transportation all contribute to pollution levels in many different ways.
The social sector may include both governmental and non-governmental organizations.
Sources of pollution by commercial & social sectors:
We refer to pollution agents as the chemicals which are released into the environment as part of the waste products generated from production and consumption activities.
In other words, pollution agents are the "operators" which make pollution "happen".
They are also known as environmental pollutants, air pollutants and so on. Some of them are carbon dioxide, sulfur dioxide, nitrogen oxides.
Feel free to learn more about environmental pollutants by further exploring our website.
PS. Please note that there are also natural causes of pollution, ex. forest fires and volcano eruptions, but the focus of this article has only been on causes of pollution brought about by human activity.
Written by: Irina Gray of Tropical-Rainforest-Animals.com
Publication Date: October 2011
© Irina Gray & Tropical-Rainforest-Animals.com
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