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题型:阅读理解-阅读单选 难度:0.4 引用次数:451 题号:15159831

Average age is rising around the world—a demographic (人口统计) change that may pose a significant challenge to efforts to slow down climate change.

Hossein Estiri at Harvard University and Emilio Zagheni of the Max Planck Institute for Demographic Research, Germany, have found that energy use increases as we get older, and not just because we tend to get wealthier. An ageing population could mean a greater proportion of society with higher energy use, their study suggests.

They combined two decades, worth of data from thousands of US households and used this to build a model to reveal how energy use varied across 17 age groups between 1987 and 2009. They found that, on average, children’s energy consumption climbs as they grow up, before dipping slightly when they leave home. Consumption then rises again when people hit their 30s, before briefly dropping after 55, and then beginning to climb again. The study involved factors such as income, local climate and the age, type and size of a person’s home. The increase in energy use at various points in our lifespan (寿命) seems to be the result of life style and how our needs change as we age.

Why does demand grow so much in our 30s?“We need more of everything. More space, a bigger TV two fridges,” says Estiri. The study found that, in warmer parts of the US, energy use increases in people over the age of 65—probably as a result of increased use of air conditioning, This suggests that there is a feedback effect between climate change and an ageing population that will only make matters worse.

Heat waves have become more common in the US in recent years and are expected to become more frequent due to global warming. More older people using more electrical energy to keep cool as temperatures rise could add to emissions, and thus drive more warming until our energy supply becomes entirely fossil fuel-free.

“This confluence of population, ageing and climate change on energy demand is really important to start thin king about,” says Estiri. Benjamin Sovacool at the University of Sussex, UK, says the work shows the importance of demographics when it comes to cutting carbon emissions. Most modelling of climate change mitigation (减缓气候变化的模型) assumes people’s energy consumption either stays the same or only changes by a small amount over time.

“This study directly challenges that entire body of research by forcing it to fight with the temporality and complexity of the consumption of energy,” says Sovacool.

Catherine Mitchell at the University of Exeter, UK, says the research could have an important influence on policy makers. “What the paper says is that there is a lot of work about how buildings use energy, but probably not enough about how the people in them use energy,” she says.

1. By saying “not just because we tend to get wealthier” in Paragraph 2, the writer probably means that      .
A.poor people can’t bring down the high demand for energy
B.a comfortable life is not the main cause of in creased energy use
C.there are some other reasons leading to the increase in energy consumption
D.people being wealthy or not has nothing to do with the rise of energy consumption
2. The underlined word “confluence” in Paragraph 6 has the similar meaning to         .
A.changeB.meetingC.decreaseD.possibility
3. What is the shortcoming of most modeling of climate change mitigation?
A.It is expensive and difficult to promote.
B.It overestimates the household energy consumption.
C.It did not take climate change adaptation into account.
D.It regards energy consumption as stable or as only slightly changing.
4. What can we learn from the last paragraph?
A.More emphasis should be put on people’s energy use.
B.The government can't do much without the support of the study.
C.It is the buildings, not the people in side, that consume the majority of the energy.
D.Policymakers have been working on how to cut down people’s energy use.

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D.How Could You Get Compensation from Airlines?
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