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Solar energy captured by solar panels is a limitless form of energy, as the earth is bombarded with extreme amounts of solar energy every day, according to the National Renewable Energy Laboratory. It's also clean, producing no carbon dioxide, and is very low-maintenance, since solar panels have no moving parts.
Unfortunately, the National Renewable Energy Laboratory says its high installation cost makes it up to four times more expensive than the cost of electricity from a standard utility company. For optimal operation and maximum energy production, it requires year-round sunny weather and is very expensive if repair is necessary, according to the U.S. Environmental Protection Agency.
There are two kinds of energy in our life. They are renewable and non-renewable sources of energy. The non-renewable energy sources include oil,coal,natural gas,... The renewable energy sources include wind, solar, biogas, hydro,... Therefore, we should use more renewable energy than non-renewable ones in the future, because the non-renewable energy sources produce a lot of carbon dioxide. That's bad for the environment, and these energy sources are going to run out soon. The renewable energy sources are abundant, cheap, clean and they're eco-friendly. They will last forever.
Renewable energy comes from a source that will not deplete. Two common examples of this type of energy are solar power and wind power. Geothermal power, hydropower, biomass, and tidal power are additional forms of renewable energy that produce power for our planet right now.
The primary advantage of renewable energy is that fewer potentially harmful emissions are released into the atmosphere. Although fossil fuels are used to create the products that allow for this power to be produced, most forms of renewable energy can become carbon neutral in 5 years or less.
The disadvantage of renewable energy is that it can be costly. Although wind power and solar power have become cost-competitive with coal-fired power and nuclear power in some communities, some forms are not cost-competitive globally yet when the cost per kilowatt hour is compared. In 2015, the lifetime cost per kilowatt hour of conventional coal was 9.5 cents, while the cost of offshore wind was 15.8 cents.
There are additional advantages and disadvantages of renewable energy to consider as well.
Renewable energy describes a collection of energy technologies i.e. solar, wind, geothermal derived from sources that are never-ending and can be replenished time after time. Most countries across the world heavily depend on fossil fuels (oil, coal andnatural gas) as sources of energy to power their economies.
Fossil fuels are non-renewable forms of energy, meaning, they utilize limited resources that will ultimately deplete, hence, driving up overall energy costs. These very countries have responded to the threat by stepping up campaigns to embrace renewable forms of energy like solar and wind
As you know, sources of energy like solar energy, wind energy,.. are very important. People use them for many things:cooking, heating,ect...But, almost the sources of energy have the disadvantages and advantages. There are two kinds of energy:non-renewable and renewable energy. Non-renewable is very popular in many countries. They are abundant, available and easy to use. However, they won't last forever and they're harmful for the environment. And, people will use renewable energy to solve the problems of non-renewable energy. Renewable sources of energy are forever and they're clean and safe, too. Nevertheless, they have some problems, too. For example, nuclear is clean but it's dangerous to use. Wind power has many advantages but it isn't available,... On the other hand, there are some sources of energy don't have some serious problems like solar energy. It's the reason why people use solar energy in the future. So, what should we do to save energy? We should use them properly and use them less. We should use less cars or motorbike, too. It also have the enviroment. Energy is very important, we should protect them for our life in the future.
When you flip on a light switch, the energy that brightens your light bulb may come from one of several potential energy sources. Different energy sources have varying advantages and disadvantages that don't just affect your utility bill but that may also have a global impact on air quality and environmental degradation.
Wind EnergyGiant wind turbines have begun to appear across North America. As wind hits the turbines, they begin to spin, and the resulting spin generates electricity that can power businesses, homes and other outfits. It provides energy without emitting greenhouse gas emissions. It's also very low-cost in the long run, as the U.S. Department of Energy estimates it to be one of the cheapest forms of renewable energy available, and it's inexhaustible as well.
However, some anti-wind activists argue that wind turbines are ugly, noisy, and dangerous to local bird species that may fly into the turbines, according to Middlebury Schools.
Solar EnergySolar energy captured by solar panels is a limitless form of energy, as the earth is bombarded with extreme amounts of solar energy every day, according to the National Renewable Energy Laboratory. It's also clean, producing no carbon dioxide, and is very low-maintenance, since solar panels have no moving parts.
Unfortunately, the National Renewable Energy Laboratory says its high installation cost makes it up to four times more expensive than the cost of electricity from a standard utility company. For optimal operation and maximum energy production, it requires year-round sunny weather and is very expensive if repair is necessary, according to the U.S. Environmental Protection Agency. Fossil FuelsFossil fuels like coal and oil are the most widely-used energy source in the world. It's typically the most plentiful, easily accessible and cheapest form of energy, according to Iowa Public Television.
However, Southern Polytechnic State University warns that fossil fuels are limited and will run out one day. Fossil fuels also endanger the environment due to the mining process and the greenhouse gas emissions produced while burning the fuel. Additionally, they may contribute to harmful side effects like air pollution and acid rain.
BiofuelsBiofuels are made from corn, sugarcane and other crops. Ethanol, widely used as a gasoline additive for powering cars, is a biofuel. It's renewable, grown domestically for greater energy security, and often produces less greenhouse gas emissions when burned, according to the National Center for Environmental Economics.
Unfortunately, growing the crops needed for biofuel may pollute the earth's soil and waterways due to farming processes and side effects like fertilizer runoff. Using crops for fuel may also use up vital food crops, and this can drive up global food prices.
I. Put the words into two groups.
| disaster | Easter | perform | festival | pollution |
| enjoy | enourmous | energy | water | natural |
| Stress on 1st syllable | Stress on 2nd syllable |
| Easter ; perform ; festival ; energy ; water ; natural | disaster ; pollution ; enjoy ;enourmous |
II. Find which word does not belong to each group.
1. A. density ( n) B. overcrowded ( adj ) C. crime (n) D. megacity (n)
2. A. drive B. cycle C. ride D. fly ( 3 cái kia là ở trên cạn , "fly" trên ko)
3. A. float (v ) B. slum (n) C. hunger (n) D. explosion (n)
4. A. safely (adv) B. poverty (n) C. slumdog (n) D. space (n)
5. A. drive ( v) B. doctor (n) C. criminal(n) D. student (n)
Cách làm mk đã ghi bên cạnh mỗi từ rồi nhé 
III. Match the two parts of the sentences.
| A | B |
| 1. overcrowded | a. the state of having very little money. |
| 2. spacious | b. a market usually held outdoors. |
| 3. slum | c. a very large city, typically one with a population of over 10 million. an |
| 4. poverty | area of a city where living conditions are extremely bad. |
| 5. megacity | d. bad health that is the result of not having enough food. |
| 6. malnutricion | e. the number of people in a place in relation to its area. |
| 7. density | f. with too many people. |
| 8. population explosion | g. large in size. |
| 9. overpopulation | h. a situation in which too many people live in a certain area. |
| 10. flea market | i. the sudden increase in the number of people in a country or in the world. |
➜1.___h__ 2.__g___ 3.__f___ 4.__a___ 5.___c__
6.___d__ 7.___e__ 8. __i___ 9.__f___ 10.__b__
IV. Rewrite the sentences, beginning as shown, so that the meaning stays the same.
1. You forgot to turn off TV lats night, didn't you?
=> You didn't remember turn off TV last night , did you ?
2. I think you should go to work by bike.
=> Why don't you go to work by bike?
3. Mr Long lived in the countryside when he was a child.
=> Mr Long used to live in the countryside when he was a child.
4. We will plant more trees along this street.
=> More trees will be planted along this street
5. Is pollution the most serious problem?
=> Pollution is the most serious problem , isn't it?
I.
| Stress on 1st syllable | Stress on 2nd syllable |
| Easter, festival,energy,water,natural | Disaster,perform,pollution,enjoy,enormous |
Nowadays, large cities are becoming more and more inhabited. The majority of the population prefer living in a big town mainly because of the great advantages it has compared to living in the countryside. However, what are the benefits of this situation, and what are the drawbacks? In this essay, I will explore the pros and cons of living in a large city and try to draw some conclusions.
Let’s start looking at the advantages. One of the main positives of a big town is the large amount of shops available in every corner of the city. What I mean by this is that whenever you live, there are some useful stores like supermarkets, banks, tobacconists and clothing stores where you can easily buy everything you need without going to the city center. Secondly, living in a big town is a big challenge for evening parties. In London, for example, there are so many things to do in the evenings like going to the cinema, to the pub or to the park during the summer period.
Turning to the other side of the argument, traffic could be one of the major disadvantages of living in a big city. Many people take the car everyday and it has also been proved that the majority of the families have at least two cars. This means that you have to deal with rush-hour traffic on your way to work and on your way back. In addition, in a big town there is consequently a lot of smog and this can really affect people’s health.
To sum up, living in a big city has great advantages but also some significant negatives.You have to weigh up to the pros of enjoying evenings’ nights outside and the availability of many shops and the cons of cope with smog and traffic issues. Personally, I believe that the benefits of enjoying the city-life and the comfort of having shops at every corner, eventually overweigh the negatives.
Overcrowding is common in many parts of the world and causes a lot of problems. Overcrowding in a country can have a significant economic impact. It can cause less natural resources. More traffic will make the air dangerous by releasing toxic gas. In addition, excessive population will make people who do not have enough housing, many of them unemployed, so there will be many slums. When life becomes difficult, there will be many crimes. Children in these places do not have enough schools to study. Finally, the environment will be severely polluted: the air environment; Water Environment; soil environment; ... It was horrible !!!