1 . It is late autumn—millions of gardeners across the northern hemisphere, pulled on their thickest sweaters, spent hours clearing large piles of leaves and packed them into plastic bags at the end of driveways.

In the US alone, nearly 10 million tonnes of garden waste go to landfill every year. That is a large amount of effort, not just from an environmental viewpoint but from that of our aching backs, too. So where does this advice come from? Well, it largely comes from the belief that thick fallen leaves can make plants under them unable to breathe, especially shorter grass. They shut down important photosynthesis (光合作用) and get in the way of the growth of the shorter grass. However, this received wisdom has recently been questioned by researchers at Wisconsin University.

The key finding of their new research was that although clearing fallen leaves is one of the most common gardening practices, it makes very little sense. In natural ecosystems, fallen leaves help return nutrients necessary for healthy plant growth to the soil, which greatly improves soil condition. Removing leaves year after year breaks this ecological (生态的) balance. Letting some leaves stick around to cover your garden is a great way to help your grass and the local ecosystem.

They further explained that if up to 50percent of your grass lawn (草坪) is covered by fallen leaves, you might as well go back indoors and put your feet up. The advantages of this light leaf coverage far outweigh the disadvantages—the leaves will quickly break down and help next year’s lawn grow far better than if you had cleared them. Only at over 50 percent coverage do the Wisconsin researchers recommend clearing.

So why not consider leaving the leaves? Save time, carbon and effort, and in exchange get a healthier lawn from this garden waste—that seems like a pretty good deal. And how many plastic bags could be saved by simply not binning fallen leaves every year? In the US alone, about 700 million.

2 . A couple has recently placed their garbage can out for collection for the first time in 14 months, all thanks to their recycling skills. Richard and Louise Arnold have established such an effective routine that they only need to put their garbage can on the side of the street once a year.

Louise explained that making small monthly changes in her life has resulted in her family producing very little waste. She said, “It’s not as difficult as you might think if you start with small steps. We began with soap, switching from bath cream to natural soap without packaging. These bars are large enough that we cut them in half, using one for the sink and the other half for the shower. It’s both cost-effective and environmentally friendly.”

“So it’s actually quite easy. Just go around your house and think of little things you can do gradually, and you’ll start noticing the difference,” Louise added. Currently, the couple takes recyclable waste to the tip, donates clothes to charity shops, and brings soft plastics and batteries to a shop that accepts them.

In 2017, the couple established No Waste Living, which initially started as a weekend stall at the local market and has since developed into a website. Louise regularly writes a newsletter for her hundreds of subscribers. They also started selling eco-friendly products, ranging from non-chemical household cleaning and washing solutions for a “less toxic home” to bamboo washing-up brushes. Louise mentioned, “I started No Waste Living because I wanted to show our achievement s and lead by example.”

Although the family occasionally faces criticism, Louise remains determined. She said, “The main point of contention(争论) for people regarding new waste rules is having to drive their waste to a recycling center, which adds to their already busy lives. However, in the long run, you will create more space in your home, save money, and spend less time dealing with garbage cans.”

4 . If you’re looking for something fun to do, pack a picnic dinner and take your family or friends to a beautiful place to eat. However, there’s a wrong trend to view picnics as an excuse to transport food in single-use plastic containers. Sure, it means the cleanup is easy at the moment, but it just puts it off to a later point, when it takes the form of volunteer cleanups and landfill management.     1     What follows is advice on how to pack such a picnic.

Using reusable containers is the easiest way to reduce waste.     2     For example, to reduce packaging, you can take along things like a loaf of bread, a whole watermelon, whole vegetables, a knife and a board to cut your food when you’re ready to eat. It doesn’t all have to be done and sealed (密封) before you leave the house.

Using washable dishes and cutlery for a picnic does not require much more work than single-use ones.

You’d have to carry the waste out anyway in a trash bag, so why not pack your dirty plates and cutlery into a bag and put them in the dishwasher at home?     3    

Forget the single-use, single-serve drink bottles.     4     Fill a large thermos (保温瓶) or personal water bottles with water, juice or lemonade at home. Compared with a single-use plastic cup, they have the added advantage of keeping your drinks colder for longer.

Cloth bags are amazing. I use them for so much more than just buying food at the store. They’re perfect for packing sandwiches, dried or whole fruit, and other snack foods. You can use them to pack glasses or plates to prevent breaking. They can also work as a napkin, tea towel, or trash bag if needed.     5    

6 . How did Cape Town, South Africa, get into a Day Zero situation—when the city’s taps would go dry because its reservoirs (水库)would become dangerously low on water? The city gets its water from six reservoirs in Western Cape province, which usually ____________ during the rainy season, from May through August. But since 2015 the region has been suffering from the worst drought (干旱)in a century, and the water in those reservoirs____________ tremendously. Compounding the problem, Cape Town’s population has grown substantially, increasing ____________ . The city actually did a pretty good job by reducing leaks in the system, a major cause of water waste, and has even won awards for its ____________ policies. But the government of South Africa was slow to declare a national disaster in the areas hit hardest by the drought, paving the way for the recent ____________.

Cape Town is not ____________ . Since 2014 southeastern Brazil has been suffering its worst water shortage in 80 years,___________ decreased rainfall,   forestation and other factors. And many cities in India do not have access to municipal water for more than a few hours a day, if at all.____________ , the city of Shimla ran out of drinking water in May, urging locals to beg tourists to stay away from the popular Himalayan summer resort.

In the U.S., the situation is somewhat better, but many urban centers still ____________ water problems. Californians recent multiyear drought led to some of the state’s driest years on record. Since about half of the state’s urban water usage is for landscaping, it was able to cut back on that fairly easily. But cities that use most of their water for more essential uses, such as drinking water, may not be so ____________ .

____________ , steps can be taken to avoid urban water crises. In general, a “portfolio approach” that relies on multiple water sources is probably most ____________ . Cape Town has already begun implementing a number of water projects, including tapping groundwater and building water-recycling plants. Many other cities will need to repair existing water infrastructure (基础建设)to cut down on leakage. City leaders should be thinking about meeting long-term needs rather than just about ____________ requirements. Good organization and financial accountability are equally critical. And planning efforts should include diverse stakeholders (利益相关者)from the community. One major challenge is providing services to informal areas, which develop without any government foresight. Such regions often ____________ basic resources一a well-planned water supply among them. The global community has an opportunity right now to take action to prevent a series of Day Zero crises. If we don’t act, many cities may soon face a time when there isn’t a drop to ____________ .

At the Shishou Milu National Nature Reserve in Hubei Province, about 2,000 creatures wander freely. Their numbers include 460 deer born this year, showing that the species,     1     was once endangered in China in the early 20th century, has staged a remarkable     2     (recover).

Often     3     (refer) to as sìbuxiang, a milu deer seems to consist of parts of various creatures. It has antlers (鹿角) like other deer, but seems to have the head of a horse, the feet of cattle and the tail of a donkey (驴).

    4     one of the animal’s three major protected areas in China, the Shishou reserve was established in 1991. Close to the Yangtze River, the area has a complete wetland ecosystem,an ideal habitat for the deer. Its conservation story provides     5     example for other endangered animals under a threat of extinction.

    6     (ensure) a safe environment, two engineers and eight rangers (护林员) are sent to get around the reserve. Advanced technologies are applied to help observe and analyze     7     (they) habits and environment. The efforts of those responsible for the deer have     8     (significant) resulted in the increase in numbers.

In the     9     (country) three major protected areas the Nanhaizi Milu Park in Beijing, the Dafeng Milu National Nature Reserve in Jiangsu Province, and the Shishou reserve——the number of the animal     10     (increase) from 39 to over 10,000 since 1986.

9 . Scientists from the National University of Singapore studied how much time twins spent in natural spaces compared with each other and found that they shared a similar level of desire to be in nature.

“The reason we decided to study this in twins is that we could estimate heritability(遗传性)based on the genetic similarities in identical twins(100%)versus genetic similarities in non-identical twins(50%),” said Chia-chen Chang, who led the study. “If a trait(特性), such as the desire to be in nature, is clearly more similar between identical twins than non-identical twins, this will then suggest a trait is heritable.”

Using the TwinsUK registry, researchers surveyed 1,153 pairs of twins—identical and non-identical—about how they experienced nature. They were required to answer questions involving how frequently they visit natural spaces such as public parks and private gardens and rate their familiarity with nature. After comparing and analyzing the collected data, researchers found that identical twins were more similar to each other in their attitudes towards nature.

While previous studies have found that spending time in natural spaces improves mental well-being, this varies from person to person. For the first time, the researchers say, this study has indicated why that is by suggesting there is likely to be a genetic component in our preference for nature and our likelihood to visit natural spaces.

However, heritability declined with age, perhaps showing that environmental factors such as access to nature and green spaces bring about a love of the outdoors as one grows older. That is to say, a person's desire to be in nature and how often they experience it are influenced by both genes and personal experiences. Those who live in urban environments without access to nature could end up having a lesser appreciation of it. Hence, it's necessary that diverse urban planning is needed to provide access to natural spaces-and the benefits they offer—for all.