We all know that global warming is caused by greenhouse gases, largely carbon dioxide, which is given out by everything ranging from home appliances(电器) and cars to the heating and lighting systems of office buildings. But since we don’t see the gas, most of us simply shake our heads and then continue with our bad habits. Now, researchers at Arizona State University are trying to change that.
Directed by associate professor Kevin Gurney, the Hestia Project’s main goal is to make something that is currently intangible (无形的) into something a little more tangible, by allowing all of us to visually see how much each and every one of us is “contributing” to global warming.
In order to obtain a complete picture of the city’s environment, the team begins by collecting data from all different sources. Then, using special software they divide the emissions (排放) into three categories — commercial entities (实体) (office buildings and industrial plants), households and vehicles. This is the stage where things start to get really interesting. That’s because instead of showing all this information using graphs that we all instantly lose interest in, they create a visual “film” that shows not only the carbon emitted by each entity, but also the exact location it is coming from and the amount, which varies depending on the time of day or season. For example, the car emissions during rush hour are the highest, as is the case for commercial buildings during the day, especially during winter months when the heating is on.
Kevin knows that some of the data shown may start a blame game among the residents (居民) of the city. However, he is hoping that the people will go beyond that and instead use it to make changes in their daily lives.
According to the text, most people ignore the problem of greenhouse gases mainly because _____.

A．the problem is not very serious

B．bad living habits are hard to change

C．greenhouse gases can’t be seen

D．they think they have done nothing wrong

With the efforts of Kevin’s team, people can _____.

A．see a film about the effects of greenhouse gases

B．study methods of cutting greenhouse gases

C．know a certain place’s emission at different times

D．get information on emissions with various graphs

By saying “some of the data shown may start a blame game among the residents of the city”, the author means that _____.

A．Kevin’s team may get criticized

B．the Hestia Project may be treated as a game

C．residents may feel guilty of their bad behavior

D．people may accuse each other of carbon emissions

What’s the purpose of the text?

A．To introduce a research project.

B．To give advice on cutting emissions.

C．To show the harm of carbon emissions.

D．To call on people to protect the environment.