1 . More than half the world’s population live in cities, and by 2050 the UN expects that proportion to reach 68%. This means more homes, roads and other infrastructure. In India alone, a city the size of Chicago will have to be developed every year to meet demand for housing. Such a construction increase is a bad sign for dealing with climate change, because making steel and concrete, two of the most common building materials, generates around 8% of the world’s CO2 emissions (排放). If cities are to expand and become greener at the same time, they will have to be made from something else.
Wood is one of the most promising sustainable (可持续的) alternatives to steel and concrete. It is not, however, everyday wood that is attracting the interest of architects.
Rather, it is a material called engineered timber. This is a combination of different layers, each designed to meet the requirements of specific parts such as floors, panels and beams (横梁). Designers can use it to provide levels of strength like steel, in a product that is up to 80% lighter. In addition, engineered timber is usually made into large sections in a factory for future use, which reduces the number of deliveries to a construction site.
According to Michael Ramage of the University of Cambridge, a wooden building produces 75% less CO2 than a steel and concrete one of the same size. However, if building with wood takes off, it does raise concern about there being enough trees to go round. But with sustainably managed forests that should not be a problem, says Dr Ramage. A family-sized apartment requires about 30 cubic metres of timber, and he estimates Europe’s sustainable forests alone grow that amount every seven seconds. Nor is fire a risk, for engineered timber does not burn easily. Besides, fireproofing layers can be added to the timber. All in all, then, it looks as if wood as a building material may get a new lease of life.
1. Why is India mentioned in paragraph 1?| A．To point out the severe pollution. |
| B．To predict the population increase. |
| C．To indicate the high degree of urbanization. |
| D．To show the great need for building materials. |
| A．It is produced at a low cost. |
| B．It hardly appeals to architects. |
| C．It helps save energy in transportation. |
| D．It possesses greater strength than steel. |
| A．Becomes cheaper. | B．Gains popularity. |
| C．Requires less work. | D．Proves sustainable. |
| A．Making Future Cities More Attractive |
| B．Living in a World with Less Emission |
| C．Building Sustainable Cities with Woods |
| D．Growing More Trees for Future Building |
2 . Biofuels (生物燃料), gained from plants and animal matter, are a key solution to the environmental problems caused by fuels like coal. “Bioalcohol (生物酒精) is the most common biofuel and is produced by sugars found in materials such as corn. With some engine redesigned, it can be used directly by cars, buses, etc.,” says Professor Daniel Tan, “12 percent of transport fuel could come from biofuels, especially bioalcohol, by 2030.”
But a 2016 study of biofuels said, “Bioalcohol presently is mostly produced with food crops. Altogether, the environmentally-friendly biofuels rely on about 2-3 percent of the global water and land used for agriculture, which could feed a large number of hungry people.”
Energy experts have therefore been trying to deal with the problem. Recent research led by an international team found that the agave (龙舌兰) plant might offer a way out. This plant tends to be the right bioalcohol source to supersede others such as sugarcane (甘蔗) and corn.
Daniel Tan explains that the agave can be grown in unfavorable conditions and is not a major food crop. “It can grow in areas that lack water and rainfall without being watered by farmers, and it does not compete with food crops or put demands on limited water. This kind of useful plant is recently being grown in Australia. It can survive Australia's hot summers,” he says.
The study finds that sugarcane produces just a little more fuel per square meter each year than the agave. However, the agave outperforms sugarcane in a range of areas, including pollution to the earth, and water using. The agave uses 69 percent less water than sugarcane and 46 percent less water than corn for the same amount of fuel produced. As for corn，it produces less fuel per square meter each year than the agave.
However, Daniel Tan states: “The first generation of bioalcohol from the agave recently faces a big competition from oil, whose recent low price makes it far more attractive to customers. Without some policy support from the government, bioalcohol production from the agave faces big challenges.”
1. What can we learn about bioalcohol from the first paragraph?| A．It is popular among customers worldwide. |
| B．It is a kind of biofuel made from artificial matter. |
| C．It helps vehicles' engines stay in good condition. |
| D．It can play a big role in making transport fuel green. |
| A．Take the place of. | B．Take advantage of. |
| C．Get away from. | D．Get along with. |
| A．It improves the local weather. | B．It keeps the water in the ground. |
| C．It produces plenty of food for humans. | D．It puts low demands on growing environment. |
| A．Reduce the price of oil. | B．Make some favorable policies. |
| C．Expand agave bioalcohol's production. | D．Introduce competition into agave bioalcohol market. |
3 . Two women going on a journey to green their city is the best way to describe the founders of Utility, Portland's low-waste and reuse company. It started in January 2019 and opened its first retail shop in April. Its founders, Rebecca Rottman and Nadine Appenbrink, are deeply committed to sustainability and supporters of zero waste.
They started Utility as a second job for both and as a personal journey, looking for clean products that didn't come in plastic. Their goal is to reduce the amount of single-use plastics by allowing people to bring their own reusable containers when they buy environmental friendly home and personal care items.
Every week the women teamed up with local stores to sell their goods and to refill products for returning customers. Now they are operating only online for pickup or local delivery in the Portland area. It is really easy, the company said. Just shop online and choose a container. Then select pickup or delivery. The products include all-natural dish bar soap and a wide variety of plastic-free kitchen tools.
While not completely zero waste, Utility is striving to get extremely close. Appenbrink said, “We are all on a journey. And we want to be as approachable as possible. Utility is to raise awareness about this lifestyle.” They are focused on careful growth because Utility will never ship products because of the carbon footprint involved in shipping.
There are zero waste stores in other communities, like Clean Kilo in Birmingham UK, but they are real brick and mortar (实体的) buildings. Utility's concept is so simple that it can be followed almost anywhere. Zero waste markets are the way to the circular economy that is needed to stop plastic waste, reduce our carbon footprint and have a sustainable future.
1. Why did Rebecca and Nadine found Utility?| A．To satisfy people's basic needs. | B．To offer job chances to local people. |
| C．To raise money for a personal journey. | D．To promote the use of reusable containers. |
| A．Reducing their carbon footprint. | B．Offering more home-made products. |
| C．Providing low-price shipping service. | D．Expanding their market internationally. |
| A．It is a hard job to stop plastic waste. | B．It is easy to copy Utility's practice. |
| C．Zero waste stores should run offline. | D．Traditional shops produce more waste. |
| A．Two women are going on an eco-travel |
| B．Single-use plastics are replaced in Portland |
| C．A community online shop helps Portland go zero waste |
| D．A Portland company is changing plastic into green products |
