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  3. Scientists measured the impact that people have on the enviroment using a term called carbon "footprint". That footprint reflect

Scientists measured the impact that people have on the enviroment using a term called carbon "footprint". That footprint reflect

admin2019-04-15  42
问题    Scientists measured the impact that people have on the enviroment using a term called carbon "footprint". That footprint reflects the amount of carbon dioxide that is emitted (排放) into the atmosphere as a result of someone’ s daily activities. Carbon footprints tend to be low for city dwellers (城镇居民). Living in a suburb outside a city, however, can turn that footprint into a bootprint.
   Energy researchers Christopher Jones and Daniel Kammen calculated carbon footprints for people in every zip code across the United States. People living in city centers had small footprints , the researchers found. " It is much easier to have a low carbon impact if your home is close to where your work, shop and play, " explains Jones. Living within walking or biking distance cuts back on the amount of carbon dioxide associated with moving people by cars. And cities with extensive bus and subway networks allow people to travel great distances while keeping releases of climate-altering greenhouse gases low.
   Not everyone can afford to live in the city, however. And not everyone wants to. Rings of suburbs have popped up around major cities across the world. Suburbs offer more space, allowing people to build larger homes. Suburbs may offer better schools for a family’ s kids. But those homes are typically well beyond walking distance from where their owners work, play and learn. So people who live in suburbs often drive long distances.
   The new findings are an important contribution to climate research, says Matthew Kahn, an enviromental economist at the University of California, who was not involved with the study. Kahn would like to see the analysis applied to other parts of the world—Europe, India and China, for instance. That would give scientists a better feel for how culture might mix with location to influence our carbon footprints.
What is the key factor mentioned to explain the new findings?
选项 A、Distance travelled by cars.
B、Spending habits.
C、Size of families.
D、Attitude towards energy saving.
答案A
解析 推理题。根据文章第二段最后两句可知，生活在步行或骑自行车就能到的范围内的人们可以减少开车出行时产生的二氧化碳排放量。拥有发达的公交和地铁网络的城市，人们可以在远距离出行的同时保持较低的温室气体排放量。所以，影响碳排放量大小的关键在于是否开车以及开车距离长短，所以选项A(开车的距离)正确。选项B(消费习惯)、选项C(家庭大小)和选项D(对节能的态度)文中均未提到。故本题选A。
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