Some bullet trains don’t run on tracks at all. They fly over them. They
2 . When it comes to lowering our carbon emissions (排放), it seems that nothing is simple. Electric vehicles (EVs) act as an example of potential greenwash. “They seem very attractive at first sight,” writes The Next Web in a report. “When we look more closely, it becomes clear that they have a substantial carbon footprint.”
The rare earth metals and costly minerals included as essential ingredients in EV batteries are not renewable. What’s more, their extraction (提炼) is often anything but green.
So the question is: is it worth it? Just how much emission reduction can EVs justify? Luckily, a life cycle assessment has been done to give us some answers.
“A life cycle analysis of emissions considers three phases,” writes The Next Web. “the manufacturing phase, the use phase, and the recycling phase.” In the manufacturing phase, the battery is to blame. “Emissions from manufacturing EV batteries were estimated to be 3.2 tons of carbon dioxide (CO2), 1/4 of those from an electric car, 13 tons of CO2. Those were bigger than emissions from gas cars, 10.5 tons of CO2.” If the vehicle life is assumed to be 150,000 kilometers, emissions from the manufacturing phase of an electric car are higher than gas cars.”
In the use phase, the source of electricity the consumer is using to power their car comes into play in a major way. “To understand how the emissions of electric car vary with a country’s renewable electricity share, consider Australia and New Zealand,” continues the report. “In 2018, Australia’s share of renewables in electricity was about 21%. In contrast, the number in New Zealand’s was about 84%. Electric car emissions in Australia and New Zealand are estimated at about 170g and 25g of CO2 per km respectively. As a consumer, our car is only as green as our country’s energy mix.”
Finally, in the recycling phase, we look at vehicle dismantling(拆除), vehicle recycling, battery recycling, and material recovery. “The estimated emissions in this phase, based on a study, are about 1.8 tons for a gas car and 2.4 tons for an electric car. This difference is mostly due to the emissions from battery recycling, which is 0.7 tons,” shows in the report. “While electric cars cause more greenhouse gas emissions than gas cars do, it's important to note the recycled batteries can be used in subsequent batteries. This could have significant emissions reduction benefits in the future. For complete life cycle emissions, the study shows that EV emissions are 18% lower than gas cars.”
So here’s the takeaway: EVs are greener. Maybe they’re not as green as we thought. There’s certainly room for improvement. But the real challenge lies in speeding the global energy transition toward greener energy-production.
1. Why is a life cycle analysis of emissions made?A.To illustrate the advantages of EVs. |
B.To show how gas cars outperform EVs. |
C.To weigh the environmental impact of EVs. |
D.To examine the energy sources of gas cars and EVs. |
A.By giving instructions. | B.By highlighting features. |
C.By making comparisons. | D.By analyzing cause and effect. |
A.Recycling of batteries. | B.Overall driving distance. |
C.Manufacturing technology. | D.Government’s energy policy. |
A.EVs are worthy of the praise they have received. |
B.EVs are not successful for their environmental downsides. |
C.EVs will no longer be widely accepted for their emissions. |
D.EVs are not truly green until their energy sources become green. |
Once a small county in mountains and little-known to the rest of China, Chongli in Hebei Province, where most of the snow sports
Recently, police in Mumbai have come up with a new system to punish those who cannot wait at traffic lights
假如你是李华,你们学校将组织学生参观首都博物馆(the Capital Museum)。请参考下面提供的信息,给来自英国的交换生Chris写一封邮件,告诉他活动安排。
邮件的开头和结尾已为你写好,不计入总词数。
Time | July 12 |
Activities | listen to a lecture on Chinese history try on traditional Chinese clothes and do a role-play learn to make a teapot and take it home … |
How’s everything going?
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Best regards,
Li Hua
注意:1.文章的开头已经给出。
2.提示词: 报废车abandoned vehicles
![]() 对校车的信任度 | ![]() 对校车的担心 |
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The government built a cycle path on the road for those
8 . The good news is that more people bought electric cars in 2020. The bad news is that SUVs continued to grow in popularity, too. The fall in oil consumption due to the first trend was completely cancelled out by the second, say Laura Cozzi and Apostolos Petropoulos at the International Energy Agency (IEA) in France.
The growing popularity of SUVs is making it even harder to cut carbon dioxide emissions(排放)and meet climate goals. “Policy-makers need to find ways to persuade consumers to choose smaller and more efficient cars,” says Petropoulos.
Oil consumption by conventional cars – not including SUVs – is estimated to have fallen 10 percent in 2020, or by more than 1.8 million barrels(桶)a day, Cozzi and Petropoulos say in a commentary published by the IEA on 15 January. Most of this fall was due to reduced travel and is likely to be temporary.
But a small part of the drop, around 40,000 barrels a day, was as a result of the increased share of electric vehicles (EVs). “We have seen a skyrocketing of global electric car sales in 2020,” says Petropoulos. Unfortunately, the number of SUVs increased as well. While overall car sales fell in 2020, 42 percent of buyers chose SUVs, up around three percentage points from 2019.
Globally, there are now more than 280 million SUVs being driven, up from fewer than 50 million in 2010. On average, SUVs consume 20 percent more energy per kilometre than a medium-sized car.
The increase in SUVs in 2020 led to a rise in oil consumption that cancelled out the effect of electric cars, says Petropoulos. Much the same is true over the past decade. Between 2010 and 2020, global CO2 emissions from conventional cars fell by nearly 350 megatonnes, due to factors such as fuel efficiency improvements as well as the switch to electric cars. Emissions from SUVs rose by more than 500 megatonnes.
“While the growth in EVs is encouraging, the increase in SUVs is heart-breaking,” says Glen Peters at the CICERO climate research centre in Norway.
There are many reasons for the growing popularity of SUVs, says Petropoulos. Rising prosperity(繁荣)in many countries means more people are able to afford them, for instance. Some people see them as a symbol of social position. SUVs are also heavily advertised by car-makers, he says, whose profits are higher on these vehicles.
There are now some electric SUVs available. “Hopefully, in time, you will see electric vehicles entering the SUV market,” says Peters.
Even if it happens, switching to electric SUVs isn’t an ideal solution. Due to their size and bigger batteries, it takes more resources to build electric SUVs, and they consume around 15 percent more electricity. Higher electricity demand makes it harder to green the electricity supply.
1. Which of the following statements is true according to the passage?A.The SUVs driven in 2019 reached up to 280 million. |
B.Electric cars appeared a sharp decline in sales in 2020. |
C.Buyers of SUVs in 2020 increased 42 percent than those in 2019. |
D.Global SUVs being driven now are over five times as many as those in 2010. |
A.it could have harmful consequences for the air quality |
B.the oil consumption will increase and the price will fall |
C.people all over the world are getting wealthier than before |
D.the car-makers think it’s unnecessary to advertise any more |
A.The purchases of SUVs should be reduced. |
B.The SUVs should be discontinued immediately. |
C.The awareness of using electric cars needs to be improved. |
D.Increasing electric cars can solve the problem of oil consumption. |
A.Unconcerned. | B.Disapproving. |
C.Supportive. | D.Uncertain. |