CLEAN AIR & POLLUTION
WHAT IS CLEAN AIR?
A Clean Air Act is one of a number of pieces of legislation relating to the reduction of airborne contaminants, smog and air pollution in general. The use by governments to enforce clean air standards has contributed to an improvement in human health and longer life spans.
Additionally, air quality legislation has led to widespread use of atmospheric dispersion models, including point source models, roadway air dispersion models and aircraft air pollution models in order to analyze air quality impacts of proposed major actions.
There are a few things we can do to reduce pollution:
Making our Vehicles Cleaner
Transportation is the major source of U.S. dependence on imported oil and the sector that has had the fastest growth in greenhouse gas emissions over the past two decades. Yet the efficiency of our light duty vehicle fleet is at a 20-year low and efforts to promote alternative fuel vehicles in the marketplace have largely failed. Nonetheless, the urgent need to reverse the business-as-usual growth path in greenhouse gas emissions in the next two decades to avoid serious if not catastrophic climate change necessitates action to make our vehicles cleaner.
Changing Our Climate
The sun's heat is the source of energy for life on earth. Although some heat radiating from the sun is reflected back out of the earth's atmosphere, heat-trapping gases like carbon dioxide, methane and nitrous oxides absorb much. The concentration of these "greenhouse gases" is increasing because of human activity and the result is the "enhanced greenhouse effect".
When burned for fuel, the carbon stored in fossil fuels like oil, gas and coal is released in the form of carbon dioxide. Since the beginning of the Industrial Revolution, the concentration of carbon dioxide in the atmosphere has increased by 30%. If emissions continue at today's rate, concentrations will double by the middle of the next century.
Naturally occurring greenhouse gases (such as water vapour, carbon dioxide, methane, and nitrous oxide) keep the Earth warm enough to support life. Scientific studies show that a variety of human activities release greenhouse gases. These include the burning of fossil fuels for electrical energy, heat and transportation. By increasing the concentration of present greenhouse gases and by adding new ones like CFCs, humankind is capable of raising the average global temperature.
Most carbon emissions, in fact 75 percent, come from industrial, commercial and agricultural sources. These are called "common emissions" because no single individual is responsible for them. North America individually account for 30 percent of emissions. These "individual emissions" are what you directly influence by your personal transportation choices, recreational interests and energy use in the home. Of course, the choices you're able to make are also affected by the standards and regulations set by governments and the commitment of industry to use energy-efficient technology.
Tackling Our Clean Air problems
Our environment is composed of interdependent parts. In tackling climate change, you're also making an important contribution to solving other environmental problems. By taking a bus or bike, or buying more efficient appliances and economical used cars, you not only reduce carbon emissions, but you also reduce toxic air pollutants and acid precipitation - which damage the health of humans, crops, forests and water by using solar energy where possible.
By redirecting your biodegradable waste from the garbage to the compost, you not only reduce methane emissions (another significant greenhouse gas), you also enrich your soil - eliminating the need for chemical fertilizers - and reduce the land demands of your local landfill.
We need first Clean Air then Clean water to survive, without these two there would be no life.Air pollution is the human introduction into the atmosphere of chemicals, particulate matter, or biological materials that cause harm or discomfort to humans or other living organisms, or damages our environment. Air pollution causes deaths and respiratory disease. Air pollution is often identified with major stationary sources, but the greatest source of emissions is mobile sources mainly cars. Gases such as CARBON DIOXIDE which contribute to global warming, have recently gained recognition as pollutants by climate scientists, while they also recognize the carbon dioxide is essential for plant life through photosynthesis. The atmosphere is a complex, dynamic natural gaseous system that is essential to support life on plant Earth. Stratospheric Ozone Depletion due to air pollution has long been recognized as a threat to human health as well as to the Earth's ecosystems.
WHY We NEED CLEAN AIR?
- We need clean air to live.
- Body needs Oxygen. Oxygen carried out to our brain via our hearts which pumps blood full of Oxygen into our brain.
- People have choices. a) Have a clean air into their bodies, 2) Or smoke and become unhealthy.
- People die of poor quality air.
- Because of polluted air Asthma in children have grown by 80% in the last decade.
- Green house gas emissions has been damaged by vehicle emissions contributing significantly to increase CO2 levels.
It is surrounding atmosphere and condition for existence. It is also an essential natural process or an outcome of occurrence. It is two types:
- Positive Environment. Father
- Negative Environment. Mother.
- Above points 1+2 marry and give birth to the Children.
- So environment has positive such as sun/ moon/ earth/ forest/ cold/ hot/ deserts. Negative such as insects, pests etc which both form an environment. Negative and positive make environment.
The first thing all beings need is clean air, then clean water and good food to survive. Without clean air nothing will survive. Unfortunately Air, soil, water and foods are polluted with our own hands.
Once up on a time our air, soil and water used to be clean one, but...
Air pollution is the introduction of
chemical, particulate matter, or biological materials that cause harm or
discomfort to human or other living organisms, or damage the natural
environment, into the atmosphere. The atmosphere is a complex dynamic natural
gaseous system that is essential to support life on planet Earth. Stratospheric
ozone deletion due to air pollution has long been recognized as a threat to
human health as well as to the Earth's ecosystems. An air pollution is known as
a substance in the air that can cause harm to humans and the environment.
Pollutions can be in the form of solid particles, liquid droplets, or gases. In
addition, they may be natural or man-made. Pollutions can be classified as
either primary or secondary. Usually:
1. primary pollutions are substances directly emitted from a process, such as ash from volcanic eruption, the carbon monoxide gas from a motor vehicle exhaust or sulfur dioxide released from factories.
2. Secondary pollutions are not emitted directly, rather they form in the air when primary pollutions react or interact. An important example of a secondary pollutant is ground level ozone one of the many secondary pollutants that make up photochemical smog. Note that some pollutants may be both primary and secondary: that is they are both emitted directly and formed from other primary pollutants. About four percent of deaths in the United States can be attributed to air pollution, according to the environmental Science Engineering Program at the Harward School of public health.
SOIL POLLUTIONis caused by the presence of man-made chemicals or both alteration in the natural soil environment. This type of contamination typically arises from the rupture of underground storage tanks, application of pesticides. Percolation of contaminated surface water to subsurface strata, oil and fuel dumping, leaching of wastes from landfills or direct discharge of industrial wastes to the soil. The most common chemicals involved are petroleum hydrocarbons, solvents, pesticides, lead and other heavy metals. This occurrence of this phenomenon is correlated with the degree of industrialization and intensities of chemical usage. The concern over soil contamination stems primarily from health risks, both of direct contact and from secondary contamination of water supplies, mapping of contaminated soil sites and the resulting cleanup are time consuming and expensive tasks, requiring extensive amounts of geology, hydrology, chemistry and computer modeling skills. It is in North America and Western Europe that the extent of contaminated land is most well known, with many of countries in these areas having a legal framework to identify and deal with this environmental problem; this however may be just the tip of the iceberg with developing countries likely to be the next generation of new soil contamination. China and United States have the most widespread soil contamination, have actually been leaders in defining and implementing standards for cleanup. Other industrialized countries have a large number of contaminated sites.
She is a girl. She eighteen years old. This has been as a result of the greedy, eager and unconcerned people who have destroyed their country and have stolen their wealth and made a civil war, and selling arms to the ignorant people to kill each other in the name of God or whatever....
STARVATION is s severe reduction in vitamin, nutrient, and energy intake, and is the most extreme form of malnutrition. In humans, prolonged starvation (in excess of 1-2 months) causes permanent organ damage and eventually death. According to the World health Organization, hunger is the gravest single threat to the world's public health the WHO also states that malnutrition is by far the biggest contributor to child mortality.
WATER POLLUTION is the contamination of water bodies such as lakes, rivers, oceans, and groundwater. All water pollution affects organisms and plants that live in these water bodies and in almost all cases the effect is damaging either to individual species and populations but also to the natural biological communities. It occurs when pollutions are discharged directly or indirectly into water bodies without adequate treatment to remove harmful constituents. Water pollution is major problem in the global context. It has been suggested that it is the leading worldwide cause of deaths and diseases, that in accounts for the deaths of more than 14,000 people daily. In addition to the acute problems of water pollution in developing countries continue to straggle with pollution problems as well. In the most recent national report on water quality in the Untied States, 45 % of assessed stream miles, 47 percent of assessed lake acres, and 32 percent of assessed bay and estuarine square miles were classified as polluted. Water is typically referred to as polluted when it is impaired by anthropogenic contaminants and either does not support a human use, like serving as drinking water, and/or undergoes a marked shift in its ability to support its constituent biotic communities, such as fish. Natural phenomena such as volcanoes, algae blooms, storms, earthquakes also cause major changes in water quality and the ecological status of water. Water pollution has many causes and characteristics.