global ecological problems
TRANSCRIPT
Global Ecological problems.
Urbanization-hygienic
problems.
Urbanization
The expanding Los Angeles metropolitan area is an early example of suburbanization.
Urbanization
Urbanization, urbanisation or urban drift is the physical growth of urban areas as a result of global change. The United Nations projected that half of the world's population would live in urban areas at the end of 2008.
Urbanization
Urbanization is closely linked to modernization, industrialization, and the sociological process of rationalization. Urbanization can describe a specific condition at a set time, i.e. the proportion of total population or area in cities or towns, or the term can describe the increase of this proportion over time. So the term urbanization can represent the level of urban relative to overall population, or it can represent the rate at which the urban proportion is increasing.
Urbanization
Urbanization is closely linked to modernization, industrialization, and the sociological process of rationalization. Urbanization can describe a specific condition at a set time, i.e. the proportion of total population or area in cities or towns, or the term can describe the increase of this proportion over time. So the term urbanization can represent the level of urban relative to overall population, or it can represent the rate at which the urban proportion is increasing.
Movement
Percentage of population which is urbanized, by country, as of 2006.
Movement
As more and more people leave villages and farms to live in cities, urban growth results. The rapid growth of cities like Chicago in the late 19th century and Mumbai a century later can be attributed largely to rural-urban migration. This kind of growth is especially commonplace in developing countries. This growth can also be attributed to new job opportunities.
Movement
The rapid urbanization of the world’s population over the twentieth century is described in the 2005 Revision of the UN World Urbanization Prospects report. The global proportion of urban population rose dramatically from 13% (220 million) in 1900, to 29% (732 million) in 1950, to 49% (3.2 billion) in 2005. The same report projected that the figure is likely to rise to 60% (4.9 billion) by 2030.
Movement
Percentage of World Population: Urban vs. Rural.
Movement
According to the UN State of the World Population 2007 report, sometime in the middle of 2007, the majority of people worldwide will be living in towns or cities, for the first time in history; this is referred to as the arrival of the "Urban Millennium" or the 'tipping point'. In regard to future trends, it is estimated 93% of urban growth will occur in developing nations, with 80% of urban growth occurring in Asia and Africa.
Movement
Urbanization rates vary between countries. The United States and United Kingdom have a far higher urbanization level than China, India, Swaziland or Niger, but a far slower annual urbanization rate, since much less of the population is living in a rural area.
Movement
Urbanization in the United States never reached the Rocky Mountains in locations such as Jackson Hole, Wyoming; Telluride, Colorado; Taos, New Mexico; Douglas County, Colorado and Aspen, Colorado. The state of Vermont has also been affected, as has the coast of Florida, the Birmingham-Jefferson County, AL area, the Pacific Northwest and the barrier islands of North Carolina.
Movement
In the United Kingdom, two major examples of new urbanization can be seen in Swindon, Wiltshire and Milton Keynes, Buckinghamshire.These two towns show some of the quickest growth rates in Europe.
Center of São Paulo, one of the largest metropolises in the world.
Causes
Population age comparison between rural Pocahontas County, Iowa and urban Johnson County, Iowa, illustrating the flight of young adults (red) to urban centers in Iowa.
Causes
The City of Chicago, Illinois is an example of the early American grid system of development. The grid is enforced even on uneven topography.
Causes
Urbanization is not always attributed to high density. In Manila, the cost of living has forced residents to live in low quality slums and shanty towns
Causes
Urbanization occurs naturally from individual and corporate efforts to reduce time and expense in commuting and transportation while improving opportunities for jobs, education, housing, and transportation. Living in cities permits individuals and families to take advantage of the opportunities of proximity, diversity, and marketplace competition.
Causes
People move into cities to seek economic opportunities. A major contributing factor is known as "rural flight". In rural areas, often on small family farms, it is difficult to improve one's standard of living beyond basic sustenance. Farm living is dependent on unpredictable environmental conditions, and in times of drought, flood or pestilence, survival becomes extremely problematic. In modern times, industrialization of agriculture has negatively affected the economy of small and middle-sized farms and strongly reduced the size of the rural labor market.
Causes
Cities, in contrast, are known to be places where money, services and wealth are centralized. Cities are where fortunes are made and where social mobility is possible. Businesses, which generate jobs and capital, are usually located in urban areas. Whether the source is trade or tourism, it is also through the cities that foreign money flows into a country. It is easy to see why someone living on a farm might wish to take their chance moving to the city and trying to make enough money to send back home to their struggling family.
Causes
There are better basic services as well as other specialist services that aren't found in rural areas. There are more job opportunities and a greater variety of jobs. Health is another major factor. People, especially the elderly are often forced to move to cities where there are doctors and hospitals that can cater for their health needs. Other factors include a greater variety of entertainment (restaurants, movie theaters, theme parks, etc.) and a better quality of education, namely universities. Due to their high populations, urban areas can also have much more diverse social communities allowing others to find people like them when they might not be able to in rural areas.
Causes
These conditions are heightened during times of change from a pre-industrial society to an industrial one. It is at this time that many new commercial enterprises are made possible, thus creating new jobs in cities. It is also a result of industrialization that farms become more mechanized, putting many labourers out of work. This is currently occurring fastest in India.
Economic effects
One of the last housebuildings in the growing city of Kstovo, such as the one in the background
Economic effects
As cities develop, effects can include a dramatic increase and change in costs, often pricing the local working class out of the market, including such functionaries as employees of the local municipalities. For example, Eric Hobsbawm's book The age of revolution: 1789–1848 (published 1962 and 2005) chapter 11, stated "Urban development in our period [1789–1848] was a gigantic process of class segregation, which pushed the new labouring poor into great morasses of misery outside the centres of government and business and the newly specialised residential areas of the bourgeoisie. The almost universal European division into a 'good' west end and a 'poor' east end of large cities developed in this period
Economic effects
" This is likely due the prevailing south-west wind which carries coal smoke and other airborne pollutants downwind, making the western edges of towns preferable to the eastern ones. Similar problems now affect the developing world, rising inequality resulting from rapid urbanisation trends. The drive for rapid urban growth and often efficiency can lead to less equitable urban development, think tanks such as the Overseas Development Institute have even proposed policies that encourage labour intensive growth as a means of absorbing the influx of low skilled and unskilled labour.
Economic effects
Urbanization is often viewed as a negative trend, but can in fact, be perceived simply as a natural occurrence from individual and corporate efforts to reduce expense in commuting and transportation while improving opportunities for jobs, education, housing, and transportation. Living in cities permits individuals and families to take advantage of the opportunities of proximity, diversity, and marketplace competition.
Environmental effects
The urban heat island has become a growing concern and is increasing over the years. The urban heat island is formed when industrial and urban areas are developed and heat becomes more abundant. In rural areas, a large part of the incoming solar energy is used to evaporate water from vegetation and soil. In cities, where less vegetation and exposed soil exists, the majority of the sun’s energy is absorbed by urban structures and asphalt. Hence, during warm daylight hours, less evaporative cooling in cities allows surface temperatures to rise higher than in rural areas.
Environmental effects
Additional city heat is given off by vehicles and factories, as well as by industrial and domestic heating and cooling units. This effect causes the city to become 2 to 10 °F (1 to 6 °C) warmer than surrounding landscapes. Impacts also include reducing soil moisture and intensification of carbon dioxide emissions.
Environmental effects
In his book Whole Earth Discipline, Stewart Brand argues that the effects of urbanization are on the overall positive for the environment. Firstly, the birth rate of new urban dwellers falls immediately to replacement rate, and keeps falling. This can prevent overpopulation in the future. Secondly, it puts a stop to destructive subsistence farming techniques, like slash and burn agriculture. Finally, it minimizes land use by humans, leaving more for nature.
Changing forms
Different forms of urbanization can be classified depending on the style of architecture and planning methods as well as historic growth of areas.
In cities of the developed world urbanization traditionally exhibited a concentration of human activities and settlements around the downtown area, the so-called in-migration. In-migration refers to migration from former colonies and similar places. The fact that many immigrants settle in impoverished city centres led to the notion of the "peripheralization of the core", which simply describes that people who used to be at the periphery of the former empires now live right in the centre.
Changing forms
Recent developments, such as inner-city redevelopment schemes, mean that new arrivals in cities no longer necessarily settle in the centre. In some developed regions, the reverse effect, originally called counter urbanisation has occurred, with cities losing population to rural areas, and is particularly common for richer families. This has been possible because of improved communications, and has been caused by factors such as the fear of crime and poor urban environments. It has contributed to the phenomenon of shrinking cities experienced by some parts of the industrialized world.
Changing forms
When the residential area shifts outward, this is called suburbanization. A number of researchers and writers suggest that suburbanization has gone so far to form new points of concentration outside the downtown both in developed and developing countries such as India. This networked, poly-centric form of concentration is considered by some an emerging pattern of urbanization. It is called variously exurbia, edge city (Garreau, 1991), network city (Batten, 1995), or postmodern city (Dear, 2000). Los Angeles is the best-known example of this type of urbanization.
Changing forms
Rural migrants are attracted by the possibilities that cities can offer, but often settle in shanty towns and experience extreme poverty. In the 1980s, this was attempted to be tackled with the urban bias theory which was promoted by Michael Lipton who wrote: "...the most important class conflict in the poor countries of the world today is not between labour and capital. Nor is it between foreign and national interests. It is between rural classes and urban classes. The rural sector contains most of the poverty and most of the low-cost sources of potential advance; but the urban sector contains most of the articulateness, organization and power. So the urban classes have been able to win most of the rounds of the struggle with the countryside...".
Changing forms
Most of the urban poor in developing countries able to find work can spend their lives in insecure, poorly paid jobs. According to research by the Overseas Development Institute pro-poor urbanisation will require labour intensive growth, supported by labour protection, flexible land use regulation and investments in basic services.'
Urbanization can be planned urbanization or organic. Planned urbanization, i.e.: planned community or the garden city movement, is based on an advance plan, which can be prepared for military, aesthetic, economic or urban design reasons.
Changing forms
Examples can be seen in many ancient cities; although with exploration came the collision of nations, which meant that many invaded cities took on the desired planned characteristics of their occupiers. Many ancient organic cities experienced redevelopment for military and economic purposes, new roads carved through the cities, and new parcels of land were cordoned off serving various planned purposes giving cities distinctive geometric designs.
Changing forms
UN agencies prefer to see urban infrastructure installed before urbanization occurs. Landscape planners are responsible for landscape infrastructure (public parks, sustainable urban drainage systems, greenways etc.) which can be planned before urbanization takes place, or afterward to revitalize an area and create greater livability within a region. Concepts of control of the urban expansion are considered in the American Institute of Planners.
Urbanization As A Social Problem
Urbanization as a Social Problem How is urbanization negatively effecting our society?
The answer to this question is not a simple one. This essay will not only break down the problems of urbanization in the United States, but it will also tell you some of the attempts made to fix the problem and give some solutions as to how it could possibly be solved in the future. Also when answering this question one must understand that urbanization, can not be stopped, but only contained in a manner that will help the United States to function better as a country.
Urbanization as a Social Problem How is urbanization negatively effecting our society?
The more densely populated and more heterogeneous a community is, the more accentuated characteristics can be associated with urbanism. Urbanism causes decrease in per capita, and promotes urban violence, political instability, crime and aggressive behavior. Rapid population growth in urban areas also perpetuates poverty. Another major issue being created by this social problem is the breaking of the traditional family structure. Our cities are not working well! Sanitation, safety, transportation, housing, education and even electricity are failing.
Urbanization as a Social Problem How is urbanization negatively effecting our society?
These are all responsibilities of the government or it is at least their job to regulate these services deemed to be monopolies. And it is a known fact that monopolies deem toward inefficiency. Functionalist look at our cities as a means to profit. Cities are a place where everybody visits, and therefor vendors can raise their prices and profit more on their products.
Urbanization as a Social Problem How is urbanization negatively effecting our society?
In the United States, the breaking of the traditional family structure is an issue that has become increasingly noticeable in recent years, particularly in urbanized areas. The traditional, mom and dad, and children are rarely seen in the inner cities any more. There is a weakened bond of kinship, and declining social family significance as America has transferred industrial, educational and recreational activities to specialized institutions outside of the home.
Urbanization as a Social Problem How is urbanization negatively effecting our society?
It is depriving families of their most characteristic, historical functions. While individuals pursue their own diverging interests in their educational, vocational, religious and recreational life. With divorce rates rising, delinquency is also becoming more of a problem than before. With single parent families, children lack in the authority department due to the lack of the amount of time their parents have free to raise them.
Urbanization as a Social Problem How is urbanization negatively effecting our society?
These specialized institutions often help, but can not replace the role of a child’s guardian. As long as the divorce rate continues to increase, delinquency will continue to increase in these areas as well. The density of people reinforces effect of numbers in diversifying people and their activities and increasing the complexity of the social
7 Environmental Problems That Are Worse Than We Thought
7 Environmental Problems That Are Worse Than We Thought
With as much attention as the environment has been getting lately, you’d think that we’d be further along in our fight to preserve the world’s species, resources and the beautiful diversity of nature. Unfortunately, things aren’t nearly that rosy. In fact, many of the environmental problems that have received the most public attention are even worse than we thought – from destruction in the rain forest to melting glaciers in the Arctic. We’ve got a lot of work to do.
7 Environmental Problems That Are Worse Than We Thought
7. Mammal Extinction
Image via National Wildlife Federation
7 Environmental Problems That Are Worse Than We Thought
One in four mammals is threatened with extinction. That’s 25%, a huge number that will totally change the ecology of every corner of the earth. We could see thousands of species die out in our lifetime, and the rate of habitat loss and hunting in crucial areas like Southeast Asia, Central Africa and Central and South America is growing so rapidly, these animals barely have a chance.
7 Environmental Problems That Are Worse Than We Thought
If you think the extinction of an animal like the beautiful Iberian Lynx is no big deal, and wouldn’t have that much of an effect on the planet, think again. Not only would we be losing – mostly due to our own disregard for our surroundings – so much of the awe-inspiring diversity of nature, mass extinctions like this would cause a serious imbalance in the world’s food chain. When a predator disappears, the prey will multiply. When prey dies out, the predator will see its ranks decrease as well. Many people fail to realize just how interconnected all species on this planet really are.
7 Environmental Problems That Are Worse Than We Thought
6. The Ocean Dead Zones
Image via NASA
7 Environmental Problems That Are Worse Than We Thought
In oceans around the world, there are eerie areas that are devoid of nearly all life. These ‘dead zones’ are characterized by a lack of oxygen, and they’re caused by excess nitrogen from farm fertilizers, emissions from vehicles and factories, and sewage. The number of dead zones has been growing fast – since the 1960’s, the number of dead zones has doubled every 10 years. They range in size from under a square mile to 45,000 square miles, and the most infamous one of all is in the Gulf of Mexico, a product of toxic sludge that flows down the Mississippi from farms in the Midwest. These ‘hypoxic’ zones now cover an area roughly the size of Oregon.
7 Environmental Problems That Are Worse Than We Thought
Spanish researches recently found that many species die off at oxygen levels well above the current definition of ‘uninhabitable’, suggesting that the extent of dead zones in coastal areas that support fishing is much worse than previously thought. Robert Diaz, a Virginia Institute of Marine Science biologist, said “Everything is pointing towards a more desperate situation in all aquatic systems, freshwater and marine. That’s pretty clear. People should be worried, all over the world.”
7 Environmental Problems That Are Worse Than We Thought
As if that weren’t bad enough, global warming will likely aggravate the problem. A rise in carbon dioxide in the atmosphere will change rainfall patterns, which could create an increase in runoff from rivers into the seas in many areas.
7 Environmental Problems That Are Worse Than We Thought
5. Collapsing Fish Stock
Image via Pew Environment Group
7 Environmental Problems That Are Worse Than We Thought
Millions of people across the world depend upon fish as a major staple in their diet. As such, commercial fishermen have been pulling such a huge quantity of fish from the oceans that we’re heading toward a global collapse of all species currently fished – possibly as soon as the year 2048. Like large-scale mammal extinction, the collapse of fish species would have a major impact on the world’s ecosystems.
7 Environmental Problems That Are Worse Than We Thought
It’s not too late – yet – if overfishing and other threats to fish populations are reduced as soon as possible. Marine systems are still biologically diverse, but catastrophic loss of fish species is close at hand. 29 percent of species have been fished so heavily or have been so affected by pollution that they’re down to 10 percent of their previous population levels. If we continue the way we are fishing today, there will be a 100 percent collapse by mid-century, so we’ve got to turn this around fast.
7 Environmental Problems That Are Worse Than We Thought
4. Destruction of the Rain Forest
Image via Encyclopedia Britannica
7 Environmental Problems That Are Worse Than We Thought
‘Saving the rain forest’ has been at the forefront of the environmental movement for decades, yet here we are facing huge losses in the Amazon all the same. You might have thought that, with all the attention the rain forest has gotten, it wouldn’t need so much saving anymore – but unfortunately, global warming and deforestation mean that half of the Amazon rain forest will likely be destroyed or severely damaged by 2030.
7 Environmental Problems That Are Worse Than We Thought
The World Wildlife Fund concluded this summer that agriculture, drought, fire, logging and livestock ranching will cause major damage to 55 percent of the Amazon rain forest in the next 22 years. Another 4 percent will see damage due to reduced rainfall, courtesy of global warming. These factors will destroy up to 80 percent of the rain forest’s wildlife. Losing 60 percent of the rain forest would accelerate global warming and affect rainfall in places as far away as India. Massive destruction to the rain forest would have a domino effect on the rest of the world.
The WWF says that the ‘point of no return’, from which recovery will be impossible, is only 15 to 25 years away.
7 Environmental Problems That Are Worse Than We Thought
3. Polar Sea Ice Loss
Image via National Snow and Ice Data Center
7 Environmental Problems That Are Worse Than We Thought
Polar sea ice is melting at an unprecedented rate, and it’s not showing any signs of slowing down. It’s perhaps the most dramatic, startling visual evidence of global warming, and it’s got scientists rushing to figure out just how big of an effect the melting is going to have on the rest of the world.
7 Environmental Problems That Are Worse Than We Thought
British researchers said last week that the thickness of sea ice in the Arctic decreased dramatically last winter for the first time since records began in the early 1990s. The research showed a significant loss in thickness on the northern ice cap after the record loss of ice during the summer of 2007.
7 Environmental Problems That Are Worse Than We Thought
Scientific American warns that “human fingerprints have been detected” on both the Arctic and Antarctic regions. Antarctica had previously appeared to be the only continent on the planet where humanity’s impact on climate change hadn’t been observed. The collapse of the Larsen B and Wilkins ice shelves in the Antarctic Peninsula shows just how fast the region is warming.
7 Environmental Problems That Are Worse Than We Thought
2. CO2 Levels in the Atmosphere
Image via Visible Earth
7 Environmental Problems That Are Worse Than We Thought
The aforementioned polar sea ice loss is yet another sinister sign of carbon dioxide levels building up in the atmosphere – the main force behind global warming. Greenhouse gas emissions caused by our modern way of life – vehicles, power plants, factories, giant livestock farms – will bring devastating climate change within decades if they stay at today’s levels.
7 Environmental Problems That Are Worse Than We Thought
Average temperatures could increase by as much as 12 degrees Fahrenheit by the end of the century if emissions continue to rise, a figure that would easily make the world virtually uninhabitable for humans. A global temperature rise of just 7.2 degrees Fahrenheit would cause a catastrophic domino effect, bringing weather extremes that would result in food and water shortages and destructive floods.
7 Environmental Problems That Are Worse Than We Thought
The most recent report by the Intergovernmental Panel on Climate Change represents “the final nail in the coffin” of climate change denial, representing the most authoritative picture to date that global warming is caused by human activity. According to the panel, we must make a swift and significant switch to clean, efficient and renewable energy technologies in order to prevent the worst-case scenario
7 Environmental Problems That Are Worse Than We Thought
1. Population Explosion
Image via Wikimedia Commons
7 Environmental Problems That Are Worse Than We Thought
Whether we like to admit it or not, our very own rapidly multiplying presence on this planet is the biggest environmental problem there is, and it’s getting bigger by the minute. We voraciously consume resources, pollute the air and water, tear down natural habitats, introduce species into areas where they don’t belong and destroy ecosystems to the point of causing millions of species to become endangered and, all too often, go extinct.
7 Environmental Problems That Are Worse Than We Thought
It took nearly all of human history – from the first days of man on earth until the early 1800’s – to reach a global population of 1 billion. In just 200 years, we’ve managed to reach 6.5 billion. That means the population has grown more since 1950 than in the previous four million years. We’re adding roughly 74 million people to the planet every year, a scary figure that will probably continue to increase. All of those mouths will need to be fed. All of those bodies will need clean water and a place to sleep. All of the new communities created to house those people will continue to encroach upon the natural world.
7 Environmental Problems That Are Worse Than We Thought
All seven environmental problems detailed above are very serious, and we’ve got to start treating them that way. We may not have easy solutions, but the fact is, we simply can’t continue living our lives as if everything is peachy. These problems aren’t going to magically solve themselves. We should have begun acting generations ago, but we can’t go back in time, and that means we have to step up our efforts. If we want to keep this planet a healthy place for humans to live – for our grandchildren to enjoy – it’s time to buckle down and do everything in our power to reverse the damage we’ve done.
List of environmental issues This is a list of environmental issues. As such they relate to the anthropogenic
effects on the natural environment.
Climate change — Global warming • Global dimming • Fossil fuels • Sea level rise • Greenhouse gas • Ocean acidification • Shutdown of thermohaline circulation • Environmental impact of the coal industry
Conservation — Species extinction • Pollinator decline • Coral bleaching • Holocene extinction • Invasive species • Poaching • Endangered species
Energy — Energy conservation • Renewable energy • Efficient energy use • Renewable energy commercialization • Environmental impact of the coal industry
List of environmental issues
Environmental degradation — Eutrophication • Habitat destruction • Invasive species
Environmental health — Air quality • Asthma • Environmental impact of the coal industry • Electromagnetic fields • Electromagnetic radiation and health • Indoor air quality • Lead poisoning • Sick Building Syndrome
Genetic engineering — Genetic pollution • Genetically modified food controversies
List of environmental issues
Intensive farming — Overgrazing • Irrigation • Monoculture • Environmental effects of meat production • Slash and burn • Pesticide drift • Plasticulture
Land degradation — Land pollution • Desertification
Soil — Soil conservation • Soil erosion • Soil contamination • Soil salination
Land use — Urban sprawl • Habitat fragmentation • Habitat destruction
List of environmental issues
Nanotechnology — Nanotoxicology • Nanopollution
Nuclear issues — Nuclear fallout • Nuclear meltdown • Nuclear power • Nuclear weapons • Nuclear and radiation accidents • Nuclear safety • High-level radioactive waste management.
Overpopulation — Burial • Water crisis • Overpopulation in companion animals • Tragedy of the commons
List of environmental issues
Ozone depletion — CFC Pollution — Environmental impact of the coal industry •
Nonpoint source pollution • Point source pollution • Light pollution • Noise pollution • Visual pollution
Water pollution — Environmental impact of the coal industry • Acid rain • Eutrophication • Marine pollution • Ocean dumping • Oil spills • Thermal pollution • Urban runoff • Water crisis • Marine debris • Microplastics • Ocean acidification • Ship pollution • Wastewater • Fish kill • Algal bloom • Mercury in fish
Air pollution — Environmental impact of the coal industry • Smog • Tropospheric ozone • Indoor air quality • Volatile organic compound • Particulate matter
List of environmental issues
Reservoirs — Environmental impacts of reservoirsResource depletion — Exploitation of natural resources
• OverdraftingConsumerism — Consumer capitalism •
Planned obsolescence • Over-consumptionFishing — Blast fishing • Bottom trawling •
Cyanide fishing • Ghost nets • Illegal, unreported and unregulated fishing • Overfishing • Shark finning • Whaling
Logging — Clearcutting • Deforestation • Illegal loggingMining — Acid mine drainage • Hydraulic fracturing •
Mountaintop removal mining • Slurry impoundments
List of environmental issues
Toxins — Chlorofluorocarbons • DDT • Endocrine disruptors • Dioxin • Toxic heavy metals • Environmental impact of the coal industry • Herbicides • Pesticides • Toxic waste • PCB • Bioaccumulation • Biomagnification
Waste — Electronic waste • Litter • Waste disposal incidents • Marine debris • Medical waste • Landfill • Leachate • Environmental impact of the coal industry • Incineration • Great Pacific Garbage Patch
Effects Human health
Pollution
Overview of main health effects on humans from some common types of pollution.[26][27][28]
Human health
Adverse air quality can kill many organisms including humans. Ozone pollution can cause respiratory disease, cardiovascular disease, throat inflammation, chest pain, and congestion. Water pollution causes approximately 14,000 deaths per day, mostly due to contamination of drinking water by untreated sewage in developing countries. An estimated 700 million Indians have no access to a proper toilet, and 1,000 Indian children die of diarrhoeal sickness every day. Nearly 500 million Chinese lack access to safe drinking water. 656,000 people die prematurely each year in China because of air pollution. In India, air pollution is believed to cause 527,700 fatalities a year.[31] Studies have estimated that the number of people killed annually in the US could be over 50,000.
Human health
Oil spills can cause skin irritations and rashes. Noise pollution induces hearing loss, high blood pressure, stress, and sleep disturbance. Mercury has been linked to developmental deficits in children and neurologic symptoms. Older people are majorly exposed to diseases induced by air pollution. Those with heart or lung disorders are under additional risk. Children and infants are also at serious risk. Lead and other heavy metals have been shown to cause neurological problems. Chemical and radioactive substances can cause cancer and as well as birth defects.
Environment
Pollution has been found to be present widely in the environment. There are a number of effects of this:
Biomagnification describes situations where toxins (such as heavy metals) may pass through trophic levels, becoming exponentially more concentrated in the process.
Carbon dioxide emissions cause ocean acidification, the ongoing decrease in the pH of the Earth's oceans as CO2 becomes dissolved.
Environment
The emission of greenhouse gases leads to global warming which affects ecosystems in many ways.
Invasive species can out compete native species and reduce biodiversity. Invasive plants can contribute debris and biomolecules (allelopathy) that can alter soil and chemical compositions of an environment, often reducing native species competitiveness.
Nitrogen oxides are removed from the air by rain and fertilise land which can change the species composition of ecosystems.
Environment
Smog and haze can reduce the amount of sunlight received by plants to carry out photosynthesis and leads to the production of tropospheric ozone which damages plants.
Soil can become infertile and unsuitable for plants. This will affect other organisms in the food web.
Sulfur dioxide and nitrogen oxides can cause acid rain which lowers the pH value of soil.
EnvironmentEnvironmental health information
The Toxicology and Environmental Health Information Program (TEHIP)[33] at the United States National Library of Medicine (NLM) maintains a comprehensive toxicology and environmental health web site that includes access to resources produced by TEHIP and by other government agencies and organizations. This web site includes links to databases, bibliographies, tutorials, and other scientific and consumer-oriented resources. TEHIP also is responsible for the Toxicology Data Network (TOXNET)[34] an integrated system of toxicology and environmental health databases that are available free of charge on the web.
EnvironmentEnvironmental health information
TOXMAP is a Geographic Information System (GIS) that is part of TOXNET. TOXMAP uses maps of the United States to help users visually explore data from the United States Environmental Protection Agency's (EPA) Toxics Release Inventory and Superfund Basic Research Programs.
Regulation and monitoring
To protect the environment from the adverse effects of pollution, many nations worldwide have enacted legislation to regulate various types of pollution as well as to mitigate the adverse effects of pollution.
Pollution control
A litter trap catches floating rubbish in the Yarra River, east-central Victoria, Australia
A litter trap catches floating rubbish in the Yarra River, east-central Victoria, Australia
Pollution control
A dust collector in Pristina, Kosovo
Pollution control
Pollution control is a term used in environmental management. It means the control of emissions and effluents into air, water or soil. Without pollution control, the waste products from consumption, heating, agriculture, mining, manufacturing, transportation and other human activities, whether they accumulate or disperse, will degrade the environment. In the hierarchy of controls, pollution prevention and waste minimization are more desirable than pollution control. In the field of land development, low impact development is a similar technique for the prevention of urban runoff.
Practices
recyclingreusingreducingmitigatingpreventing
Pollution control devices
Dust collection systems Baghouses Cyclones Electrostatic precipitators
Scrubbers Baffle spray scrubber Cyclonic spray scrubber Ejector venturi scrubber Mechanically aided scrubber Spray tower Wet scrubber
Pollution control devices
Sewage treatment Sedimentation (Primary treatment) Activated sludge biotreaters (Secondary
treatment; also used for industrial wastewater) Aerated lagoons Constructed wetlands (also used for urban
runoff)
Pollution control devices
Industrial wastewater treatment API oil-water separators[15][35]
Biofilters Dissolved air flotation (DAF) Powdered activated carbon treatment Ultrafiltration
Vapor recovery systems
Perspectives
The earliest precursor of pollution generated by life forms would have been a natural function of their existence. The attendant consequences on viability and population levels fell within the sphere of natural selection. These would have included the demise of a population locally or ultimately, species extinction. Processes that were untenable would have resulted in a new balance brought about by changes and adaptations. At the extremes, for any form of life, consideration of pollution is superseded by that of survival.
Perspectives
For humankind, the factor of technology is a distinguishing and critical consideration, both as an enabler and an additional source of byproducts. Short of survival, human concerns include the range from quality of life to health hazards. Since science holds experimental demonstration to be definitive, modern treatment of toxicity or environmental harm involves defining a level at which an effect is observable. Common examples of fields where practical measurement is crucial include automobile emissions control, industrial exposure (e.g. Occupational Safety and Health Administration (OSHA) PELs), toxicology (e.g. LD50), and medicine (e.g. medication and radiation doses).
Perspectives
"The solution to pollution is dilution", is a dictum which summarizes a traditional approach to pollution management whereby sufficiently diluted pollution is not harmful.[36][37] It is well-suited to some other modern, locally scoped applications such as laboratory safety procedure and hazardous material release emergency management. But it assumes that the dilutant is in virtually unlimited supply for the application or that resulting dilutions are acceptable in all cases.
Perspectives
Such simple treatment for environmental pollution on a wider scale might have had greater merit in earlier centuries when physical survival was often the highest imperative, human population and densities were lower, technologies were simpler and their byproducts more benign. But these are often no longer the case. Furthermore, advances have enabled measurement of concentrations not possible before. The use of statistical methods in evaluating outcomes has given currency to the principle of probable harm in cases where assessment is warranted but resorting to deterministic models is impractical or unfeasible. In addition, consideration of the environment beyond direct impact on human beings has gained prominence.
Perspectives
Yet in the absence of a superseding principle, this older approach predominates practices throughout the world. It is the basis by which to gauge concentrations of effluent for legal release, exceeding which penalties are assessed or restrictions applied. The regressive cases are those where a controlled level of release is too high or, if enforceable, is neglected. Migration from pollution dilution to elimination in many cases is confronted by challenging economical and technological barriers.
Greenhouse gases and global warming
Historical and projected CO2 emissions by country.Source: Energy Information Administration.
Greenhouse gases and global warming
Carbon dioxide, while vital for photosynthesis, is sometimes referred to as pollution, because raised levels of the gas in the atmosphere are affecting the Earth's climate. Disruption of the environment can also highlight the connection between areas of pollution that would normally be classified separately, such as those of water and air. Recent studies have investigated the potential for long-term rising levels of atmospheric carbon dioxide to cause slight but critical increases in the acidity of ocean waters, and the possible effects of this on marine ecosystems.
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