Fresh water is the most important source of life on the earth. Any living thing may survive without food for days however it is impossible to imagine life without water and oxygen. The ever increasing human population enhances the demand of more water for purposes like drinking, washing, performing industrial processes, irrigating crops, arranging swimming pools and other water-sports centres. Water pollution is done by the people of all over the world because of increasing demands and competitions of luxuries life. Waste products from many human activities are spoiling the whole water and decreasing the amount of oxygen available in the water. Such pollutants are altering the physical, chemical, thermal, and biological characteristics of the water and adversely affecting the lives inside as well as outside the water.

When we drink the polluted water, harmful chemicals and other pollutants goes inside our body and deteriorates all the body organs functioning and puts our lives in danger. Such harmful chemicals also disturb the lives of animals and plants greatly. When plants absorb dirty water through their roots, they stop growing and die. Thousands of seabirds are killing because of the oil spilling from ships and industries. High level of water pollution is done due to the chemicals coming out of the agricultural usage of fertilizers, insecticides and pesticides. The effect of water pollution varies from place to place upon the type and amount of water contamination. The degradation of drinking water needs an urgent basis prevention method which is possible by the proper understanding and support from the end of each and every person living on the earth.

Soil, or land pollution is soil contamination that prevents the natural growth and balance of the land. Pollution can be present in land used for cultivation, habitation, or as a wildlife preserve. Some soil pollution is deliberate, such as the creation of landfills. However much of soil/land pollution is accidental and can have widespread effects. Soil pollution sources include: Hazardous waste and sewage spills, Non-sustainable farming practices, such as the heavy use of inorganic pesticides, Strip mining, deforestation, and other destructive practices,Household dumping and littering.

Water Pollution is the contamination of water bodies. It occurs as a result of introduction of pollutants in water. Water is life. Still, we contribute in polluting the water bodies in several ways.

Water Pollution is mainly caused as a result of improper discharge of household and industrial chemicals wastes into the water bodies.

These dangerous chemicals (in the form of solid, liquid or gases) mixes with water and make it unsafe for living bodies. Water pollutants cause harm to human-beings, animals, trees and other constituents of environment.

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Environmental pollution is the status of environmental contamination by chemical, biological ... affect human health, other living organisms.Environmental pollution is caused by humans and human management.
The main types of pollution :
- Air pollution : Smoke and dust discharge chemicals into the atmosphere. Examples of toxic gases as carbon monoxide, sulfur dioxide, cloroflorocacbon substances (CFCs) and nitrous oxide are of industrial waste and vehicle
- Water pollution occurs when surface water flows through the domes waste, industrial waste water, pollutants in the ground, and groundwater seepage.
- Soil pollution occurs when soil contaminated with toxic chemicals (concentrations exceed normal limits) by the activities of man as active mining, industrial production and use of chemical fertilizers Study or too much peside, ... or leaks from underground storage tanks. Most common types of soil contaminants are hydrocarbons, heavy metals, MTBE, herbicides, pesides, and chlorinated hydrocarbons .
- Radioactive Pollution , Noise pollution , Light Pollution ...
Affecf :
+ For human health : Air pollution can kill many living organisms including humans. Ozone pollution can cause respiratory disease, cardiovascular disease, inflammation of the throat, chest pain, breathlessness. Water pollution causes approximately 14,000 deaths per day, mainly by eating contaminated with untreated water. Chemicals and heavy metals contamination in food and drink can cause cancer. Oil spills can cause itching blisters. Noise pollution causes hearing loss, hypertension, depression, and insomnia., causing serious consequences .
+ For ecosystem :
- Sulfur dioxide and nitrogen oxides cause acid rain can reduce soil pH.
- Contaminated land may become barren, not suitable for crops. This will affect other living organisms in food webs.
- Smoke and fog reduce sunlight that plants receive to make the process of photosynthesis.
- Invasive species that can compete and occupied habitat for endangered native species, thus reducing biodiversity.
CO2 generated from the factories and passing vehicles also increases the greenhouse effect. Earth on a heating up. Gradually destroying the natural resort where it is available.
Solutions to limit environmental pollution :.
- Combat desertification and silver color.
- Natural water treatment contaminated ...
- Purify air ...
 

DỊCH :

Ô nhiễm môi trường là tình trạng môi trường bị ô nhiễm bởi các chất hóa học, sinh học... gây ảnh hưởng đến sức khỏe con người, các cơ thể sống khác . Ô nhiễm môi trường là do con người và cách quản lý của con người.
Các dạng ô nhiễm chính :
- Ô nhiễm không khí, việc xả khói chứa bụi và các chất hóa học vào bầu không khí. Ví dụ về các khí độc là cacbon mônôxít, điôxít lưu huỳnh, các chất cloroflorocacbon (CFCs), và ôxít nitơ là chất thải của công nghiệp và xe cộ .
- Ô nhiễm nước xảy ra khi nước bề mặt chảy qua rác thải sinh hoạt, nước rác công nghiệp, các chất ô nhiễm trên mặt đất, rồi thấm xuống nước ngầm.
- Ô nhiễm đất xảy ra khi đất bị nhiễm các chất hóa học độc hại (hàm lượng vượt quá giới hạn thông thường)do các hoạt động chủ động của con người như khai thác khoáng sản, sản xuất công nghiệp, sử dụng phân bón hóa học hoặc thuốc trừ sâu quá nhiều,... hoặc do bị rò rỉ từ các thùng chứa ngầm. Phổ biến nhất trong các loại chất ô nhiễm đất là hydrocacbon, kim loại nặng, MTBE, thuốc diệt cỏ, thuốc trừ sâu, và các hydrocacbon clo hóa .
- Ô nhiễm phóng xạ , Ô nhiễm tiếng ồn , Ô nhiễm ánh sáng ...
Ảnh hưởng :
+ Đối với sức khỏe con người : Không khí ô nhiễm có thể giết chết nhiều cơ thể sống trong đó có con người. Ô nhiễm ozone có thể gây bệnh đường hô hấp, bệnh tim mạch, viêm vùng họng, đau ngực, tức thở. Ô nhiễm nước gây ra xấp xỉ 14.000 cái chết mỗi ngày, chủ yếu do ăn uống bằng nước bẩn chưa được xử lý. Các chất hóa học và kim loại nặng nhiễm trong thức ăn nước uống có thể gây ung thư. Dầu tràn có thể gây ngứa rộp da. Ô nhiễm tiếng ồn gây điếc, cao huyết áp, trầm cảm, và bệnh mất ngủ., gây nhiều hậu quả nghiêm trọng .
+ Đối với hệ sinh thái :
- Điôxít lưu huỳnh và các ôxít nitơ có thể gây mưa axít làm giảm độ pH của đất.
- Đất bị ô nhiễm có thể trở nên cằn cỗi, không thích hợp cho cây trồng. Điều này sẽ ảnh hưởng đến các cơ thể sống khác trong lưới thức ăn .
- Khói lẫn sương làm giảm ánh sáng mặt trời mà thực vật nhận được để thực hiện quá trình quang hợp .
- Các loài xâm lấn có thể cạnh tranh chiếm môi trường sống và làm nguy hại cho các loài địa phương, từ đó làm giảm đa dạng sinh học.
Khí CO2 sinh ra từ các nhà máy và các phương tiện qua lại còn làm tăng hiệu ứng nhà kính. Trái Đất ngày một nóng dần lên. Phá hủy dần các khu du lịch tự nhiên mà nó sẵn có.
Giải pháp để hạn chế ô nhiễm môi trường :
- Giảm độ mặn cho đất.
- Xử lý nước tự nhiên bị ô nhiễm.
- Làm trong sạch không khí ..

Chỉ cần một loại thui mà bạn ơi

When people think of air pollution, most immediately picture heavy smog drifting over cities and industrial plants.

This is the first and most evident form of air pollution, but it’s not the only one.

Let’s begin today’s discussion by defining the term air pollution at a broader level. Air pollution in its most basic definition is the introduction of harmful substances into the Earth’s atmosphere.

These substances linger and cause many adverse effects. As you know, humans and other living creatures rely on the atmosphere for respiration. When air quality is dampened by pollution, immediate and longer term consequences take place.

Pollution has been known to cause allergies, disease, damage to crops, and in extreme cases, even death.

In addition, air pollution creates an imbalance in the natural gases that make up our Earth’s atmosphere. These imbalances slowly aid in the depletion of the Ozone layer, an essential region of the stratosphere that soaks up most of the sun’s damaging ultraviolet (UV) rays.

As the Ozone depletes, the rate of global warming increases. If enough air pollution clutters our environment, it creates the danger of more rapid deterioration of the Ozone layer.

Tham khảo:

I consider the earth quake in 2011 was the most horrible and frightful in my life. A magnitude 5.5 earthquake centered off southern Vietnam in November 2001, killed one person after a plank loosened by the shaking fell on his head. Many houses were damaged, and several people were injured as they tried to escape from their homes, including some who jumped from balconies.Luckily, none of deaths. Some schools and office buildings damaged by the quake were closed for inspection. Dien Bien Phu was the site of a key victory by Vietnamese forces against French colonialist forces in 1954. After the quake, many residents of the town stayed on the streets all night and did not dare to go back into their houses until morning,People in the whole town could not sleep for fear of another quake. Earthquakes occur infrequently in VietnamThe quake was the worst to hit Vietnam in a decade. Damage from Vietnam earthquake estimated at $13 million.

Chúc bạn học tốt!

Noise pollution is a very special type of pollution.

(Definition:) It is known to be the exposure to some high sound levels that may lead to adverse effects in humans or other living organisms. (Causes:) Noise becomes harmful when it exceeds 75 decibels (dB), such as the sound at a busy residential road. Noise is painful when above 120 dB, such as the sound of a jet taking off. (Effects:) Noise pollution affects not only the hearing but also the nervous system. It can make us deaf or have high blood pressure, nervousness, hearing loss, and sleep disturbances.

Bài này cô viết về ô nhiễm tiếng ồn, một loại ô nhiễm xảy ra ở cuộc sống hiện đại.

Cô chúc em học tập vui vẻ và có nhiều trải nghiệm bổ ích tại Hoc24.vn nhé!

There is no denying that computer is one of the all-time greatest inventions of human being. It has brought us an endless number of benefits. This miraculous tool not only allows us to edit documents, to create excel worksheets or to install programs to serve our needs but also helps our kids relax with a wide range of games and apps. However, some people believe that computers may bring more harm than benefits if children use them daily; meanwhile, others state that they are helpful and can affect children positively. In my opinion, I totally agree with the first idea because of the following reasons.\nTo begin with, children will be isolated from other people around them if they use computers frequently. It’s simply because they spend most of their time on utilizing computers, so they do not have much communication with their parents. Moreover, when computers become their close friend, they may refuse to play with other kids as well as to take part in outdoor activities. It means there is less interaction between them and their fellows. Obviously, this is not recommended for children since they need to be active and to learn new things from family and friends to broaden their horizon. \nAnother point is that using computers uncontrollably may cause children to develop some diseases. Sitting in front of the computer regularly may lead to obesity because every day, children absorb a large amount of nutrition such as fat, protein and starch but they do not take exercises to consume this energy. Seriously, obesity can put them at higher risk of developing diabetes. Besides, some research has shown that looking at the computer screen continuously with concentration more than 2 hours will reduce our vision and cause myopia easily.\nThe last reason is that children can neglect their study and sink into computer games. It goes without saying that computer games are so addictive. If kids are unable to control themselves, they may spend all their time on playing games. After completing a level, they will have promotion to continue to play and to unlock new levels, then all these things will be repeated over and over again. In addition, computer games can inhibit the ability of thinking of children because they do not need to rack their brains a lot when playing games. Consequently, their study results may become worse and this will affect their future significantly.\nIn conclusion, I am totally in agreement with the idea that using computers daily will put great negative impacts on children. However, they can still take advantages of this wonderful invention if they use it suitably and effectively. Therefore, parents should teach their kids to be self-disciplined and to manage their time well when using computers.