Population and environment: a global challenge - Curious
The environmental fidelity of these populations appears high, with 9 out of 12 reproducibly are easily isolated from a range of marine environments and animals (34). .. Of these populations, two show a relationship to named Vibrio species. impact of population and consumption on the environment. A widely known The Relation Between Population and CO2 Emissions, Controlling for GDP. Note . Numbers in the It is argued that individuals joining these movements have . opmental Studies website: mephistolessiveur.info Bin, S. Read 41 answers by scientists with 34 recommendations from their Does anyone know a method to combine economic, social and environmental indicators (of sustainable .. mephistolessiveur.info .. Your point about the relation between CO2 and population deserves its own question/ answer thread. 1.
At its simplest, it describes how human impact on the environment I is a result of a multiplicative contribution of population Paffluence A and technology T. As well as bringing the link between population and environment to a wider audience, the IPAT equation encouraged people to see that environmental problems are caused by multiple factors that when combined produced a compounding effect.
People and the Earth
More significantly, it showed that the assumption of a simple multiplicative relationship among the main factors generally does not hold—doubling the population, for example, does not necessarily lead to a doubling of environmental impact.
The reverse is also true—a reduction of the technology factor by 50 per cent would not necessarily lead to a reduction in environmental impact by the same margin. The IPAT equation is not perfect, but it does help to demonstrate that population is not the only or necessarily the most important factor relating to environmental damage. Focusing solely on population number obscures the multifaceted relationship between us humans and our environment, and makes it easier for us to lay the blame at the feet of others, such as those in developing countries, rather than looking at how our own behaviour may be negatively affecting the planet.
Population size It's no surprise that as the world population continues to grow, the limits of essential global resources such as potable water, fertile land, forests and fisheries are becoming more obvious.
But how many people is too many? How many of us can Earth realistically support? Carrying capacity is usually limited by components of the environment e. Debate about the actual human carrying capacity of Earth dates back hundreds of years. The range of estimates is enormous, fluctuating from million people to more than one trillion.The Relationship Between Population and the Environment (Part 1) - A-level Geography -
Scientists disagree not only on the final number, but more importantly about the best and most accurate way of determining that number—hence the huge variability. The majority of studies estimate that the Earth's capacity is at or beneath 8 billion people. PDF How can this be? Whether we have million people or one trillion, we still have only one planet, which has a finite level of resources. The answer comes back to resource consumption.
People around the world consume resources differently and unevenly. An average middle-class American consumes 3. So if everyone on Earth lived like a middle class American, then the planet might have a carrying capacity of around 2 billion. However, if people only consumed what they actually needed, then the Earth could potentially support a much higher figure.
But we need to consider not just quantity but also quality—Earth might be able to theoretically support over one trillion people, but what would their quality of life be like? Would they be scraping by on the bare minimum of allocated resources, or would they have the opportunity to lead an enjoyable and full life?
More importantly, could these trillion people cooperate on the scale required, or might some groups seek to use a disproportionate fraction of resources? If so, might other groups challenge that inequality, including through the use of violence?
These are questions that are yet to be answered. Population distribution The ways in which populations are spread across Earth has an effect on the environment. Developing countries tend to have higher birth rates due to poverty and lower access to family planning and education, while developed countries have lower birth rates.
These faster-growing populations can add pressure to local environments. Globally, in almost every country, humans are also becoming more urbanised. Bythat figure was 54 per cent, with a projected rise to 66 per cent by While many enthusiasts for centralisation and urbanisation argue this allows for resources to be used more efficiently, in developing countries this mass movement of people heading towards the cities in search of employment and opportunity often outstrips the pace of development, leading to slums, poor if any environmental regulation, and higher levels of centralised pollution.
Even in developed nations, more people are moving to the cities than ever before. The pressure placed on growing cities and their resources such as water, energy and food due to continuing growth includes pollution from additional cars, heaters and other modern luxuries, which can cause a range of localised environmental problems. Humans have always moved around the world. However, government policies, conflict or environmental crises can enhance these migrations, often causing short or long-term environmental damage.
For example, since conditions in the Middle East have seen population transfer also known as unplanned migration result in several million refugees fleeing countries including Syria, Iraq and Afghanistan. The sudden development of often huge refugee camps can affect water supplies, cause land damage such as felling of trees for fuel or pollute environments lack of sewerage systems.
Unplanned migration is not only difficult for refugees. Having so many people living so closely together without adequate infrastructure causes environmental damage too. Population composition The composition of a population can also affect the surrounding environment. At present, the global population has both the largest proportion of young people under 24 and the largest percentage of elderly people in history. As young people are more likely to migrate, this leads to intensified urban environmental concerns, as listed above.
Life expectancy has increased by approximately 20 years since While this is a triumph for mankind, and certainly a good thing for the individual, from the planet's point of view it is just another body that is continuing to consume resources and produce waste for around 40 per cent longer than in the past. Ageing populations are another element to the multi-faceted implications of demographic population change, and pose challenges of their own.
For example between andJapan's proportion of people over 65 grew from 7 per cent to more than 20 per cent of its population. This has huge implications on the workforce, as well as government spending on pensions and health care. Increasing lifespans are great for individuals and families. But with more generations living simultaneously, it puts our resources under pressure.
Population income is also an important consideration. The uneven distribution of income results in pressure on the environment from both the lowest and highest income levels. They may also be forced to deplete scarce natural resources, such as forests or animal populations, to feed their families.
On the other end of the spectrum, those with the highest incomes consume disproportionately large levels of resources through the cars they drive, the homes they live in and the lifestyle choices they make. On a country-wide level, economic development and environmental damage are also linked. The least developed nations tend to have lower levels of industrial activity, resulting in lower levels of environmental damage.
The most developed countries have found ways of improving technology and energy efficiency to reduce their environmental impact while retaining high levels of production. It is the countries in between—those that are developing and experiencing intense resource consumption which may be driven by demand from developed countries —that are often the location of the most environmental damage.
Population consumption While poverty and environmental degradation are closely interrelated, it is the unsustainable patterns of consumption and production, primarily in developed nations, that are of even greater concern. For many, particularly in industrialised countries, the consumption of goods and resources is just a part of our lives and culture, promoted not only by advertisers but also by governments wanting to continually grow their economy. Culturally, it is considered a normal part of life to shop, buy and consume, to continually strive to own a bigger home or a faster car, all frequently promoted as signs of success.
It may be fine to participate in consumer culture and to value material possessions, but in excess it is harming both the planet and our emotional wellbeing.
Causes and effects of population decline | Population decline | mephistolessiveur.info
More clothes, more gadgets, bigger cars, bigger houses—consuming goods and resources has big effects on our planet. The environmental impact of all this consumption is huge. The mass production of goods, many of them unnecessary for a comfortable life, is using large amounts of energy, creating excess pollution, and generating huge amounts of waste. To complicate matters, environmental impacts of high levels of consumption are not confined to the local area or even country.
In Ethiopia, the rate of urban growth often strains the capacity of local and national government to provide urban residents with even the most basic services of housing, water supply, sewerage and solid waste disposal MWUD, Slums are urban areas that are heavily populated and have sub-standard housing with very poor living conditions, creating several problems.
Slum areas typically suffer from: Many low-income families gravitate to these informal settlements that proliferate in and around towns. Poverty is one of the most critical issues facing urban areas. Urban poverty degrades both the physical and social environment.
The increased demand for water from the growing population can place added stress on already stretched resources. In and around cities, water is commonly in short supply and subject to increasing competition by different users. Urban growth leads to increasing demand for water for industrial and domestic use, which conflicts with agricultural demands.
It is especially difficult to provide water and sanitation services to deprived areas and the poorest people. Many people in these areas live without access to safe drinking water and proper sanitation. Even where adequate water supplies are available, sanitation and wastewater disposal are often inadequate or missing. Pit latrines and septic tanks are the usual methods for human waste disposal but they have limited capacity and are not always adequate to cope with the quantity of waste produced by many people living close together.
Overflowing latrines and septic tanks contaminate surface water and create a serious health risk. The lack of these essential services threatens not only the health and the environment of people in slum areas, but also that of people living in formal urban areas. In Africa and Asia most of the urban centres have no sewers at all, which affects rich and poor alike. This is true of many cities with a million or more inhabitants, as well as smaller cities and towns.
It has impacts on the physical environment in several ways. Water quality In developing countries, including Ethiopia, many rivers in urban areas are more like open sewers Figure 5.
Study Session 5 Urbanisation: Trends, Causes and Effects: View as single page
The lack of sanitation and sewerage systems has a dramatic impact on urban watercourses. People use the rivers to dispose of all their wastes from homes, industries and commercial businesses.
Wastewater from human settlements contains organic material and nutrients; industrial wastewater contains many different types of toxic pollutant.
These make the water unsafe for humans to use for many purposes including drinking and irrigation, as well as harming the fish and other animals and plants living in the water. Any changes to the quality of surface water also affects groundwater because they are linked by the processes of the water cycle so pollutants from the surface will infiltrate down and contaminate soil and groundwater as well. Solid waste In many towns and cities solid waste management is inefficient or non-existent.
Solid waste management means the proper collection, transfer, recycling and disposal of all the solid material we throw away, including plastics, paper and cardboard, food wastes, electrical waste, etc. It also includes industrial, hospital and institutional wastes which often contain pathogens as well as hazardous and toxic chemicals, which need special care. Urban waste often ends up in illegal dumps on streets, open spaces, wastelands, drains or rivers.
This is frequently a problem in peri-urban areas, which are convenient for dumping wastes because of the availability of open space and ease of access from central urban areas.
Population and environment: a global challenge
This can lead to the pollution of groundwater and surface waters which may be used as a source for drinking water. Sometimes the wastes are collected and taken to legalised waste disposal sites but these are not always properly managed to protect water bodies and groundwater. The combustion of solid waste creates yet another environmental problem. People want to get rid of the wastes and they will burn them in their backyards if there is no collection system Figure 5.
Air quality Air quality in towns and cities is frequently very poor as a result of air pollution from many different sources Figure 5.