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5 tháng 2 2018

1 unless most of us replace coal fuel with gas fuel ,we can hardly centrol air pollution

->Air pollution__can hardly be controlled if most of us don't replace coal fuel with gas fuel._________

2because the airport is located near our neighborhood ,we must suffer from noise pollution every day

->we wouldn't__suffer from noise pollution every day if the airport weren't located near our neighborhood.________

3 this ship pollutant especially oilspills ,is one of main causes of the ocean pollution Therefore, we need to reduce it

->If we____reduce theis ship pollutant especially oilspills, we can reduce ocean pollution______________________remarkably

4present, level of air pollution shown in the Air Quality.Index might surprise you

->If yoy check(checked)_???_____________

5thomas expects for a amount of money to movie to another place to stay away the noisy industrial zone

->If thomas moves to another place to stay away the noisy industrial zone, he will expect for an amount of money.

6Ice melting is considered as a redult of the global warminjg we cause

->we couldn't/won't have to wory about global warming if there weren't ice melting.

5 tháng 2 2018

1 unless most of us replace coal fuel with gas fuel ,we can hardly control air pollution

->Air pollution can hardly be controlled unless most of us replace coal fuel with gas fuel.

2because the airport is located near our neighborhood ,we must suffer from noise pollution every day

->we wouldn't have suffered from noise pollution everyday if the air port hadn't located near our neighborhood.

3 this ship pollutant especially oilspills ,is one of main causes of the ocean pollution Therefore, we need to reduce it

->If we reduce this ship pollutant especially oilspills, the ocean pollution will reduce remarkably

4present, level of air pollution shown in the Air Quality.Index might surprise you

->If you check(checked)the level of air pollution at present by the Air Quality Index, you might be suprised.

Bn ơi 2 câu còn lại mk k làm vì mk chưa biết làm hoặc bn chép đề sai nhen

8 tháng 5 2016

clean air

8 tháng 5 2016
fresh air

Chúc bạn học tốt

Air pollution occurs when wastes dirty the air. People reduce most of the wastes that cause air pollution. Such wastes can be in the form of gases or particles of solid or liquid matter. These substances result chiefly from burning fuel to power motor vehicles and to heat the buildings. Industrial processes and the burning of garbage also contribute to air pollution. Besides, there are other polluting substances that exist naturally in the air. They include dust, pollen, soil particles, and...
Đọc tiếp

Air pollution occurs when wastes dirty the air. People reduce most of the wastes that cause air pollution. Such wastes can be in the form of gases or particles of solid or liquid matter. These substances result chiefly from burning fuel to power motor vehicles and to heat the buildings. Industrial processes and the burning of garbage also contribute to air pollution. Besides, there are other polluting substances that exist naturally in the air. They include dust, pollen, soil particles, and naturally occurring gases.

The rapid growth of population and industry and the increasing use of automobiles and airplanes have made air pollution a serious problem. The air we breathe has become so filled with pollutants that it can cause health problems. It also harms plants, animals, buildings materials, and fabrics.

1.     Where do most of wastes that cause air pollution come from?

………………………………………………………………………………....……

2.     What contributes to air pollution?

………………………………………………………………………………………

3. What are natural pollutants?

……………………………………………………………………………………

4. What has made air pollution a serious problem?

……………………………………………………………………………………

1
20 tháng 8 2021

1.     Where do most of wastes that cause air pollution come from?

…………………………………They come from burning fuel to power motor vehicles and to heat the buildings.……………………………………………....……

2.     What contributes to air pollution?

……………………………… Industrial processes and the burning of garbage………………………………………………………

3. What are natural pollutants?

………………………………dust, pollen, soil particles, and naturally occurring gases……………………………………………………

4. What has made air pollution a serious problem?

 

……………………The rapid growth of population and industry and the increasing use of automobiles and airplanes………………………………………………………………

Air pollution occurs when wastes dirty the air. People produce most of the wastes that cause air pollution. Such wastes can be in the form of gases or particles of solid or liquid matter. These substances result chiefly from burning fuel to power motor vehicles and to heat buildings. Industrial processes and the burning of garbage also contribute to air pollution. Besides, there are other polluting substances that exist naturally into the air. They include dust, soil particles, and naturally...
Đọc tiếp

Air pollution occurs when wastes dirty the air. People produce most of the wastes that cause air pollution. Such wastes can be in the form of gases or particles of solid or liquid matter. These substances result chiefly from burning fuel to power motor vehicles and to heat buildings. Industrial processes and the burning of garbage also contribute to air pollution. Besides, there are other polluting substances that exist naturally into the air. They include dust, soil particles, and naturally occurring gases.        

The rapid growth of population, industry and the increasing use of automobiles and airplanes have made air pollution a serious problem. The air we breathe has become so filled with pollutants that it can cause health problems. It also harms plants, animals, building materials, and fabrics.

 

Answer True or False

1.All of the wastes that people produce cause air pollution.                                                      _________

2.Soil participles are natural pollutants.                                                                                       ________

3.Polluted air has a harmful influence on people, plants and animals.                                        ________

4.Air pollution has become a serious problem due to the increasing population and industry.   ________

Choose the best answer

5. The word “they” in line 5 refers to:                                                                                         ________

A. motor vehicles        B. natural pollutants    C. Industrial processes            D. buildings

6. What does not contribute to air pollution?                                                                               _______

A. The burning of garbage      B. industrial processes           

C. motor vehicles                    D. the natural existence of oxygen in the air

1
10 tháng 10 2021

1 F

2 T

3 T

4 T

5 B

6 B

The environment is everything around us, both natural and made by man. A major problem in the world today is the destruction of the natural environment.This is a complicated problem. We burn fuel, and this causes air pollution. We throw away plastic bags, containing toys and other objects. These stay in the environment, they are not like paper or wood that slowly disappear. We made thousands of new chemicals. Factories that make or use chemicals always have chemical wastes. These are often...
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The environment is everything around us, both natural and made by man. A major problem in the world today is the destruction of the natural environment.

This is a complicated problem. We burn fuel, and this causes air pollution. We throw away plastic bags, containing toys and other objects. These stay in the environment, they are not like paper or wood that slowly disappear. We made thousands of new chemicals. Factories that make or use chemicals always have chemical wastes. These are often poisonous, and they also stay in the environment.

Air pollution is by far the most harmful form of pollution in our environment. Air pollution is caused by the exhaust fume emitted by cars, buses and trucks, trains, and factories. Even smoke from burning leaves and cigarettes is harmful to the environment and causes a lot of damage to man and the atmosphere. Evidence of increasing air pollution is seen in lung cancer, asthma, allergies, and various breathing problems. Even the birds have been affected,with severe air pollution preventing from reaching their seasonal metropolitan destinations of centuries

1. What is a big problem in the world today?

A. The development of the population.

B. The destruction of the natural environment.

C. Birds dying.

D. Air pollution.

2. Facories that make or use chemicals ………………..

A. always clean up their wastes

B. produce chemical wastes

C. keep the air clean

D. throw away toys and other objects

3. According to the passage, what is the cause of the air pollution

A. Smoke from vehicles

B. Burning leaves and cigarettes

C. Chemical wastes

D. A & B are correct

4. What does increasing pollution cause?

A. lung cancer and asthma

B. allergies

C. other respiratory problem

D. All the correct

5. What is third paragraph about?

A. Air pollution and exhaust fume

B. Air pollution and burning cigarettes

C. Air pollution and its effects

D. Air pollution and the resolutions

1
4 tháng 4 2021

1. What is a big problem in the world today?

A. The development of the population.

 B. The destruction of the natural environment.

C. Bomb testing.

D. Throwing away plastic bags.

2. Facories that make or use chemicals ………………..

A. always clean up their wastes

B. produce chemical wastes

C. keep the air clean

D. throw away toys and other objects

3. According to the passage, what is the cause of the air pollution

A. Smoke from vehicles

B. Burning leaves and cigarettes

C. Chemical wastes

D. A & B are correct

4. What does increasing pollution cause?

A. lung cancer and asthma

B. allergies

C. other respiratory problem

D. All the correct

5. What is third paragraph about?

A. Air pollution and exhaust fume

B. Air pollution and burning cigarettes

C. Air pollution and its effects

D. Air pollution and the resolutions

The environment is everything around us, both natural and made by man. A major problem in the world today is the destruction of the natural environment.This is a complicated problem. We burn fuel, and this causes air pollution. We throw away lastic bags, containing toys and other objects. These stay in the environment, they are not like paper or wood that slowly disappear. We have made thousands of new chemicals. Factories that make or use chemicals always have chemical wastes. These are often...
Đọc tiếp

The environment is everything around us, both natural and made by man. A major problem in the world today is the destruction of the natural environment.

This is a complicated problem. We burn fuel, and this causes air pollution. We throw away lastic bags, containing toys and other objects. These stay in the environment, they are not like paper or wood that slowly disappear. We have made thousands of new chemicals. Factories that make or use chemicals always have chemical wastes. These are often poisonous, and they also stay in the environment.

Since 1945 several countries have been testing nuclear bombs in the air and underground. The explosions in the air cause nuclear fallout. The fallout causes cancer and kills animals and people. Nuclear power plants that make electricity also produce dangerous wastes and have accidents that can be very disastrous.

* Choose the correct answer

3. The nuclear fallout causes 

A. smoke from vehicles

B. Burning fuel, plastic bags and wastes from factories

C. A and B

1
Read the passage.      There are three main (1) ……………… of pollution: air pollution, water pollution and noise pollution. Air, which is the most important element of our environment for our (2) ……………………, can be polluted in many ways. Smoke in the air from mills, factories and industry (3) …………………… carbon, monoxide, carbon dioxide, and methane, which are all poisonous gases. This leads (4) …………………… health problems like asthma and lung diseases, and the thinning of the ozone layer, which (5)...
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Read the passage.

      There are three main (1) ……………… of pollution: air pollution, water pollution and noise pollution. Air, which is the most important element of our environment for our (2) ……………………, can be polluted in many ways. Smoke in the air from mills, factories and industry (3) …………………… carbon, monoxide, carbon dioxide, and methane, which are all poisonous gases. This leads (4) …………………… health problems like asthma and lung diseases, and the thinning of the ozone layer, which (5) …………………… us from harmful UV ray. China, the USA, Russia, India, Mexico and Japan are the world leaders in air pollution (6) …………………… Water is also polluted by the discharge of commercial and industrial waste. Sewage in drinking water is another (7) …………………… of water pollution as it contains germs and viruses. The noise of vehicles, mills, and factories can be really unbearable. This kind of constant sound also (8) ……………… headaches, tension, (9) ……..…………  stress and migraines. People living next to a building site where there is too much noise can become sick, as they can not sleep or relax. This is (10) …………………… noise pollution.

8-Point Star: 11Choose the best answer (A, B, C or D).

      1.   A. types                       B. kinds                       C. models                    D. both A & B

      2.   A. survival                   B. survive                    C. surviving                 D. survived

      3.   A. includes                  B. include                    C. contains                  D. contain

      4.   A. in                            B. into                         C. to                            D. from

      5.   A. prevents                  B. protects                   C. avoids                     D. hides

      6.   A. emissions                B. emitted                   C. emission                  D. emitting

      7.   A. effect                      B. cause                       C. result                       D. consequence

      8.   A. causes                     B. leads to                   C. results in                 D. all are correct

      9.   A. brain                       B. mind                       C. head                        D. mental

      10. A. told                         B. called                      C. said                         D. mentioned

3
24 tháng 1 2022

1, B

2, A

3, C

4, C

5, B

6, A

7, B

8, A

9, D

10. B

24 tháng 1 2022

Choose the best answer (A, B, C or D).

      1.   A. types                       B. kinds                       C. models                    D. both A & B

      2.   A. survival                   B. survive                    C. surviving                 D. survived

      3.   A. includes                  B. include                    C. contains                  D. contain

      4.   A. in                            B. into                         C. to                            D. from

      5.   A. prevents                  B. protects                   C. avoids                     D. hides

      6.   A. emissions                B. emitted                   C. emission                  D. emitting

      7.   A. effect                      B. cause                       C. result                       D. consequence

      8.   A. causes                     B. leads to                   C. results in                 D. all are correct

      9.   A. brain                       B. mind                       C. head                        D. mental

 

      10. A. told                         B. called                      C. said                         D. mentioned

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42. Environmental pollution is one of the impacts of human activities on the Earth. Pollution occurs when pollutants contaminate the natural surroundings; which brings about changes that affect our normal lifestyles adversely. Pollution disturbs our ecosystem and the balance in the environment. Pollution occurs in different forms; air, water,...
Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42.

Environmental pollution is one of the impacts of human activities on the Earth. Pollution occurs when pollutants contaminate the natural surroundings; which brings about changes that affect our normal lifestyles adversely. Pollution disturbs our ecosystem and the balance in the environment. Pollution occurs in different forms; air, water, soil, radioactive, noise, heat/ thermal and light Let us discuss the causes and effects of air pollution on mankind and the environment as a whole.

Air pollution is the most prominent and dangerous form of pollution. It occurs due to many reasons. Excessive burning of fuel which is a necessity of our daily lives for cooking, driving and other industrial activities; releases a huge amount of chemical substances in the air every day; these pollute the air. Smoke from chimneys, factories, vehicles or burning of wood basically occurs due to coal burning; this releases sulphur dioxide into the air making it toxic.

The effects of air pollution are evident too. The increase in the amount of CO2 in the atmosphere leads to smog which can restrict sunlight from reaching the earth. Thus, preventing plants in the process of photosynthesis. Gases like sulfur dioxide (SO2) and nitrogen oxide (NO) can cause acid rain.

The decrease in quality of air leads to several respiratory problems including asthma or lung cancer. Chest pain, congestion, throat inflammation, cardiovascular disease, respiratory disease are some of diseases that can be caused by air pollution.

The emission of greenhouse gases particularly CO2 is leading to global warming. Every other day new industries are being set up, new vehicles come on roads and trees are cut to make way for new homes. All of them, in direct or indirect way lead to increase in CO2 in the environment. The increase in CO2 leads to melting of polar ice caps which increases the sea level and pose danger for the people living near coastal areas.

Ozone layer is the thin shield high up in the sky that stops ultra violet rays from reaching the earth. As a result of human activities, chemicals, such as chlorofluorocarbons (CFCs), were released into the atmosphere which contributed to the depletion of ozone layer.

Question 40: According to paragraph 5, air pollution contributes to the greenhouse effect which can lead to

A. global warming

B. polar ice melting

C. increase in CO2 in the environment

D. global warming, polar ice melting, rise of sea levels and danger for people

1
15 tháng 11 2017

Đáp án D

Theo như đoạn văn thứ 5,6 ô nhiễm môi trường góp phần gây ra hiệu ứng nhà kính mà có thể dẫn tới __________.

A. việc trái đất nóng lên                                         B. tan băng ở cực

C. sự gia tăng khí CO2 trong môi trường

D. việc trái đất nóng lên, tan bang ở cực, mực nước biển dâng và nguy hiểm cho con người.

Căn cứ vào các câu: The emission of greenhouse gases particularly CO2 is leading to global warming.

The increase in CO2 leads to melting of polar ice caps which increases the sea level and pose danger for the people living near coastal areas.

(Sự phát thải khí nhà kính đặc biệt khí CO2 đang dẫn đến sự nóng lên toàn cầu.

Sự gia tăng CO2 dẫn đến sự tan chảy của các chỏm băng cực làm tăng mực nước biển và gây nguy hiểm cho những người sống gần các khu vực ven biển)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42.Environmental pollution is one of the impacts of human activities on the Earth. Pollution occurs when pollutants contaminate the natural surroundings; which brings about changes that affect our normal lifestyles adversely. Pollution disturbs our ecosystem and the balance in the environment. Pollution occurs in different forms; air, water, soil,...
Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42.

Environmental pollution is one of the impacts of human activities on the Earth. Pollution occurs when pollutants contaminate the natural surroundings; which brings about changes that affect our normal lifestyles adversely. Pollution disturbs our ecosystem and the balance in the environment. Pollution occurs in different forms; air, water, soil, radioactive, noise, heat/ thermal and light Let us discuss the causes and effects of air pollution on mankind and the environment as a whole.

Air pollution is the most prominent and dangerous form of pollution. It occurs due to many reasons. Excessive burning of fuel which is a necessity of our daily lives for cooking, driving and other industrial activities; releases a huge amount of chemical substances in the air every day; these pollute the air. Smoke from chimneys, factories, vehicles or burning of wood basically occurs due to coal burning; this releases sulphur dioxide into the air making it toxic.

The effects of air pollution are evident too. The increase in the amount of CO2 in the atmosphere leads to smog which can restrict sunlight from reaching the earth. Thus, preventing plants in the process of photosynthesis. Gases like sulfur dioxide (SO2) and nitrogen oxide (NO) can cause acid rain.

The decrease in quality of air leads to several respiratory problems including asthma or lung cancer. Chest pain, congestion, throat inflammation, cardiovascular disease, respiratory disease are some of diseases that can be caused by air pollution.

The emission of greenhouse gases particularly CO2 is leading to global warming. Every other day new industries are being set up, new vehicles come on roads and trees are cut to make way for new homes. All of them, in direct or indirect way lead to increase in CO2 in the environment. The increase in CO2 leads to melting of polar ice caps which increases the sea level and pose danger for the people living near coastal areas.

Ozone layer is the thin shield high up in the sky that stops ultra violet rays from reaching the earth. As a result of human activities, chemicals, such as chlorofluorocarbons (CFCs), were released into the atmosphere which contributed to the depletion of ozone layer.

 

According to paragraph 5, air pollution contributes to the greenhouse effect which can lead to____.

A. global warming 

B. polar ice melting

C. increase in  C O 2 in the environment

D. global warming, polar ice melting, rise of sea levels and danger for people.

1
6 tháng 2 2018

Đáp án D

Theo như đoạn văn thứ 5,6 ô nhiễm môi trường góp phần gây ra hiệu ứng nhà kính mà có thể dẫn tới __________.

A. việc trái đất nóng lên

B. tan băng ở cực 

C. sự gia tăng khí  C O 2  trong môi trường

D. việc trái đất nóng lên, tan bang ở cực, mực nước biển dâng và nguy hiểm cho con người.

Căn cứ vào các câu: The emission of greenhouse gases particularly  C O 2  is leading to global warming.

The increase in  C O 2  leads to melting of polar ice caps which increases the sea level and pose danger for the people living near coastal areas.

(Sự phát thải khí nhà kính đặc biệt khí  C O 2  đang dẫn đến sự nóng lên toàn cầu.

Sự gia tăng  C O 2  dẫn đến sự tan chảy của các chỏm băng cực làm tăng mực nước biển và gây nguy hiểm cho những người sống gần các khu vực ven biển)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42.Environmental pollution is one of the impacts of human activities on the Earth. Pollution occurs when pollutants contaminate the natural surroundings; which brings about changes that affect our normal lifestyles adversely. Pollution disturbs our ecosystem and the balance in the environment. Pollution occurs in different forms; air, water, soil,...
Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 42.

Environmental pollution is one of the impacts of human activities on the Earth. Pollution occurs when pollutants contaminate the natural surroundings; which brings about changes that affect our normal lifestyles adversely. Pollution disturbs our ecosystem and the balance in the environment. Pollution occurs in different forms; air, water, soil, radioactive, noise, heat/ thermal and light Let us discuss the causes and effects of air pollution on mankind and the environment as a whole.

Air pollution is the most prominent and dangerous form of pollution. It occurs due to many reasons. Excessive burning of fuel which is a necessity of our daily lives for cooking, driving and other industrial activities; releases a huge amount of chemical substances in the air every day; these pollute the air. Smoke from chimneys, factories, vehicles or burning of wood basically occurs due to coal burning; this releases sulphur dioxide into the air making it toxic.

The effects of air pollution are evident too. The increase in the amount of CO2 in the atmosphere leads to smog which can restrict sunlight from reaching the earth. Thus, preventing plants in the process of photosynthesis. Gases like sulfur dioxide (SO2) and nitrogen oxide (NO) can cause acid rain.

The decrease in quality of air leads to several respiratory problems including asthma or lung cancer. Chest pain, congestion, throat inflammation, cardiovascular disease, respiratory disease are some of diseases that can be caused by air pollution.

The emission of greenhouse gases particularly CO2 is leading to global warming. Every other day new industries are being set up, new vehicles come on roads and trees are cut to make way for new homes. All of them, in direct or indirect way lead to increase in CO2 in the environment. The increase in CO2 leads to melting of polar ice caps which increases the sea level and pose danger for the people living near coastal areas.

Ozone layer is the thin shield high up in the sky that stops ultra violet rays from reaching the earth. As a result of human activities, chemicals, such as chlorofluorocarbons (CFCs), were released into the atmosphere which contributed to the depletion of ozone layer.

 

Which of the following can be inferred from the passage?

A. The more modern our lives become, the more serious the pollution is

B. People can control air pollution soon in the future

C. Only air pollution is dangerous and has a negative impact on humans and the environment

D.  C O 2 is the cause of the depletion of ozone layer

1
9 tháng 9 2017

Đáp án A.

Có thể suy ra điều gì từ đoạn văn?

A. Đời sống của chúng ta càng trở nên hiện đại, vấn đề ô nhiễm càng trở nên nghiêm trọng.

B. Con người có thể sớm kiểm soát vấn đề ô nhiễm không khí trong tương lai.

C. Chỉ có ô nhiễm không khi mới nguy hiểm và có những ảnh hưởng tiêu cực đến con người và môi trường.

D. Khí CO2 là nguyên nhân của việc suy giảm tầng ozone.

Tạm dịch

Ô nhiễm môi trường là một trong những tác động của hoạt động con người vào trái đất. Ô nhiễm xảy ra khi các chất ô nhiễm gây ô nhiễm môi trường tự nhiên; mang lại những thay đổi ảnh hướng đến lối sống bình thường của chúng ta. Ô nhiễm gây rối loạn hệ sinh thái của chúng ta và sự cân bằng trong môi trường. Ô nhiễm xảy ra ở các dạng khác nhau; không khí, nước, đất, phóng xạ, tiếng ồn, sức nóng/ nhiệt và ánh sáng. Hãy để chúng tôi thảo luận về nguyên nhân và ảnh hướng của ô nhiễm không khí đối với nhân loại và môi trường nói chung.

Ô nhiễm không khí là dạng ô nhiễm nguy hiểm và nổi bật nhất. Nó xảy ra do nhiều lý do. Việc đốt cháy nhiên liệu quá mức cần thiết cho cuộc sống hàng ngày của chúng ta để nấu ăn, lái xe và các hoạt động công nghiệp khác; giải phóng một lượng lớn chất hóa học trong không khí hàng ngày; những chất này làm ô nhiễm không khí. Khói từ các ống khói, nhà máy, xe cộ hoặc đốt gỗ về cơ bản xảy ra do

đốt than; điều này giải phóng sulfur dioxide vào không khí làm cho nó độc hại.

Các tác động của ô nhiễm không khí cũng rất hiển nhiên. Sự gia tăng lượng CO2 trong khí quyển dẫn đến khói bụi có thế hạn chế ánh sáng mặt trời chiếu vào trái đất. Do đó, ngăn chặn thực vật trong quá trình quang hợp. Các loại khí như sulphur dioxide và nitơ oxit có thể gây ra mưa axit.

Việc giảm chất lượng không khí dẫn đến một số vấn đề hô hấp bao gồm hen suyễn hoặc ung thư phổi. Đau ngực, nghẹt mũi, viêm cổ họng, bệnh tim mạch, bệnh hô hấp là một số bệnh có thể là nguyên nhân gây ô nhiễm không khí.

Sự phát thải khí nhà kính đặc biệt là CO2 đang dẫn đến sự nóng lên toàn cầu. Mỗi ngày các ngành công nghiệp mới đang được thiết lập, xe mới đi trên đường và cây cối bị chặt để nhường chỗ cho những ngôi nhà mới. Tất cả chúng, theo cách trực tiếp hoặc gián tiếp đều dẫn đến gia tăng CO2 trong môi trường. Sự gia tăng CO2 dẫn đến sự tan chảy của các chỏm băng cực làm tăng mực nước biển và gây nguy hiểm cho những người sống gần các khu vực ven biển.

Lớp ôzôn là lá chắn mỏng trên bầu trời cao ngăn tia cực tím chiếu vào trái đất. Bởi vì các hoạt động của con người, các hóa chất, chẳng hạn như chlorot1uorocarhons (CFCs), được giải phóng vào khí quyển góp phần làm suy giảm tầng ôzôn.