Light pollution is a significant but overlooked driver of the rapid decline of insect populations, according to the most comprehensive review of the scientific evidence to date.
Artificial light at night can affect every aspect of insects' lives, the researchers said. "We strongly believe artificial light at night — in combination with habitat loss, chemical pollution.invasive (入侵的) species, and climate change — is driving insect declines, " the scientists concluded after assessing more than 150 studies.
Insect population collapses have been reported around the world, and the first global scientific review published in February, said widespread declines threatened to cause a "catastrophic collapse of nature's ecosystems".
There are thought to be millions of insect species, most still unknown to science, and about half are active at night. Those active in the day may also be disturbed by light at night when they are at rest.
The most familiar impact of light pollution is moths (飞蛾) flapping around a bulb, mistaking it for the moon. Some insects use the polarisation of light to find the water they need to breed, as light waves line up after reflecting from a smooth surface. But artificial light can scupper (使泡汤) this. Insects are important prey (猎物) for many species, but light pollution can tip the balance in favour of the predator if it traps insects around lights. Such increases in predation risk were likely to cause the rapid extinction of affected species, the researchers said.
The researchers said most human-caused threats to insects have analogues in nature, such as climate change and invasive species. But light pollution is particularly hard for insects to deal with.
However, unlike other drivers of decline, light pollution is relatively easy to prevent. Simply turning off lights that are not needed is the most obvious action, he said, while making lights motion-activated also cuts light pollution. Shading lights so only the area needed is lit up is important. It is the same with avoiding blue-white lights, which interfere with daily rhythms. LED lights also offer hope as they can be easily tuned to avoid harmful colours and flicker rates.
What is discussed in the passage?A.Causes of declining insect populations. |
B.Consequences of insect population collapses. |
C.Light pollution: the key bringer of insect declines. |
D.Insect declines: the driver of the collapsed ecosystem. |
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【推荐1】Zero waste was a radical lifestyle movement a few years back. I remember showing my parents a video of Bea Johnson, sharing how cool I thought it would be to buy groceries with jars, and have so little trash! A few days later, I came back with my first jars of zero waste groceries, and my dad commented on how silly it was for me to carry jars everywhere. It came off as a bit discouraging.
Yet as the months of reducing waste continued, I did what I could that was within my own reach. I had my own bedroom, so I worked on removing things I didn’t need. Since I had my own toiletries (洗漱用品), I was able to start personalising my routine to be more sustainable. I also offered to cook every so often, so I portioned out a bit of the cupboard for my own zero waste groceries. Perhaps your household won’t entirely make the switch, but you may have some control over your own personal spaces to make the changes you desire.
As you make your lifestyle changes, you may find yourself wanting to speak up for yourself if others comment on what you’re doing, which can turn itself into a whole household debate. If you have individuals who are not on board, your words probably won’t do much and can often leave you feeling more discouraged.
So here is my advice: Lead by action.
1. What was the attitude of the author’s father toward buying groceries with jars?A.He disapproved of it. | B.He was favorable to it. |
C.He was tolerant of it. | D.He didn’t care about it. |
A.She is quite good at cooking. | B.She respects others’ privacy. |
C.She enjoys being a housewife. | D.She is a determined person. |
【推荐2】King Canute couldn’t stop the ocean’s tide from rolling in — can Africa hold back the desert?That’s certainly what the continent is tying to do with its proposed “Great Green Wall”, 800km (almost 5,00 miles) worth of trees that officials hope will stop the advancement of the Sahara Desert, which has been rapidly expanding southward.
The idea was introduced in the 1970s when the once-rich region turned barren (贫瘠的) due to climate change and intensive land use. But it’s not a new idea; China has its own desert vegetation project to hold back the Gobi Desert! Thanks to the Chinese plan, the African project aims to plant 100 million hectares of trees by 2030 across the entire Africa. The initiative is a decade in, and around 15% completed, and there have already been benefits for many communities and wildlife. It’s bringing life back to the continent’s degraded landscapes at an unprecedented scale, providing not only food security and jobs but a reason to stay for the millions who live along its path.
The creators of the wall hope it will bring an urgently needed solution to the threats facing the African continent, creating 10 million jobs in rural areas, as well as preventing 250 million tons of carbon. The initiative is Africa-driven, which for those on the continent, is vital, and may hold the key to success. “The Great Green Wall…is about ownership, and that has been the failure of development aid because people were never identified with it,” said Elvis Paul Tangam, African Union Commissioner for the Sahara and Sahel Great Green Wall Initiative.“But this time they identify. This is the very thing of us!”
The wall may seem like a moonshot, but all the best ideas usually are. As Thomas Sankara, former president of Burkina Faso said in 1985, “You cannot carry out fundamental change without a certain degree of madness. The courage to turn your back on the old formulas, the courage to invent the future.”
What does “us” underlined in Paragraph 3 refer to?
A.African Unions. | B.All advocates. | C.Land owners. | D.All Africans. |
2. Which one moves you the most? Why?
【推荐1】With the young unable to afford to leave home and the old at risk of isolation(孤独), more families are choosing to live together.
The doorway to peace and quiet, for Nick Bright at least, leads straight to his mother-in-law: she lives on the ground floor, while he lives upstairs with his wife and their two daughters.
Four years ago they all moved into a three-storey Victorian house in Bristol — one of a growing number of multigenerational families in the UK living together under the same roof. They share a front door and a washing machine, but Rita Whitehead has her own kitchen, bathroom, bedroom and living room on the ground floor.
“We floated the idea to my mum of sharing a house,” says Kathryn Whitehead. Rita cuts in: “We spoke more with Nick because I think it’s a big thing for Nick to live with his mother-in-law.”
And what does Nick think? “From my standpoint, it all seems to work very well. Would I recommend it? Yes, I think I would.”
It’s hard to tell exactly how many people agree with him, but research indicates that the numbers have been rising for some time. Official reports suggest that the number of households with three generations living together had risen from 325,000 in 2001 to 419,000 in 2013.
Other varieties of multigenerational family are more common. Some people live with their elderly parents; many more adult children are returning to the family home, if they ever left. It is said that about 20% of 25-34-year-olds live with their parents, compared with 16% in 1991.The total number of all multigenerational households in Britain is thought to be about 1.8 million.
Stories like that are more common in parts of the world where multigenerational living is more firmly rooted. In India, particularly outside cities, young women are expected to move in with their husband’s family when they get married.
What is the text mainly about?A.Lifestyles in different countries. | B.Conflicts between generations. |
C.A housing problem in Britain. | D.A rising trend of living in the UK. |
【推荐2】Goffin’s cockatoos, a kind of small parrot native to Australasia, have been shown to have similar shape-recognition abilities to a human two-year-old. Though not known to use tools in the wild, the birds have proved skilful at tool use while kept in the cage. In a recent experiment, cockatoos were presented with a box with a nut inside it. The clear front of the box had a “keyhole” in a geometric shape, and the birds were given five differently shaped “keys” to choose from. Inserting the correct “key” would let out the nut.
In humans, babies can put a round shape in a round hole from around one year of age, but it will be another year before they are able to do the same with less symmetrical (对称的) shapes. This ability to recognize that a shape will need to be turned in a specific direction before it will fit is called an “allocentric frame of reference”. In the experiment, Goffin’s cockatoos were able to select the right tool for the job, in most cases, by visual recognition alone. Where trial-and-error was used, the cockatoos did better than monkeys in similar tests. This indicates that Goffin’s cockatoos do indeed possess an allocentric frame of reference when moving objects in space, similar to two-year-old babies.
The next step, according to the researchers, is to try and work out whether the cockatoos rely entirely on visual clues (线索), or also use a sense of touch in making their shape selections.
What does the follow-up test aim to find out about the cockatoos?
A.How far they are able to see. | B.How they track moving objects. |
C.Whether they are smarter than monkeys. | D.Whether they use a sense of touch in the test. |
【推荐3】Turning soil, pulling weeds, and harvesting cabbage sound like tough work for middle and high school kids. And at first it is, says Abby Jaramillo, who with another teacher started Urban Sprouts, a school garden program at four low-income schools. The program aims to help students develop science skills, environmental awareness, and healthy lifestyles.
Jaramillo’s students live in neighborhoods where fresh food and green space are not easy to find and fast food restaurants outnumber grocery stores. “The kids literally come to school with bags of snacks and large bottles of soft drinks,” she says. “They come to us thinking vegetables are awful, dirt is awful, insects are awful.” Though some are initially scared of the insects and turned off by the dirt, most are eager to try something new.
Urban Sprouts’ classes, at two middle schools and two high schools, include hands-on experiments such as soil testing, flower-and-seed dissection, tastings of fresh or dried produce, and work in the garden. Several times a year, students cook the vegetables they grow, and they occasionally make salads for their entire schools.
Program evaluations show that kids eat more vegetables as a result of the classes. “We have students who say they went home and talked to their parents and now they’re eating differently,” Jaramillo says.
She adds that the program’s benefits go beyond nutrition. Some students get so interested in gardening that they bring home seeds to start their own vegetable gardens. Besides, working in the garden seems to have a calming effect on Jaramillo’s special education students, many of whom have emotional control issues. “They get outside,” she says, “and they feel successful.”
What do we know about Abby Jaramillo?
A.She used to be a health worker. |
B.She grew up in a low-income family. |
C.She owns a fast food restaurant. |
D.She is an initiator of Urban Sprouts. |
What does the passage mainly talk about?
A.How our brain controls overeating. |
B.How the aDCN works up our appetite. |
C.How Prader-Willi syndrome can be prevented. |
D.How lowering food intake benefits our overall health. |
【推荐2】Terrafugia Inc. said Monday that its new flying car has completed its first flight, bringing the company closer to its goal of selling the flying car within the next year. The vehicle —named the Transition – has two seats, four wheels and wings that fold up so it can be driven like a car. The Transition, which flew at 1,400 feet for eight minutes last month, can reach around 70 miles per hour on the road and 115 in the air. It flies using a 23-gallon tank of gas and burns 5 gallons per hour in the air. On the ground, it gets 35 miles per gallon.
Around 100 people have already put down a $10,000 deposit to get a Transition when they go on sale, and those numbers will likely rise after Terrafugia introduces the Transition to the public later this week at the New York Auto Show. But don’t expect it to show up in too many driveways. It’s expected to cost $279,000. And it won’t help if you’re stuck in traffic. The car needs a runway.
Inventors have been trying to make flying cars since the 1930s, according to Robert Mann, an airline industry expert. But Mann thinks Terrafugia has come closer than anyone to making the flying car a reality. The government has already permitted the company to use special materials to make it easier for the vehicle to fly. The Transition is now going through crash tests to make sure it meets federal safety standards.
Mann said Terrafugia was helped by the Federal Aviation Administration’s decision five years ago to create a separate set of standards for light sport aircraft, which are lower than those for pilots of larger planes. Terrafugia says an owner would need to pass a test and complete 20 hours of flying time to be able to fly the Transition, a requirement pilots would find relatively easy to meet.
What is the best title for the text?
A.Flying Car at Auto Show |
B.The Transition’s First Flight |
C.Pilots’ Dream Coming True |
D.Flying Car Closer to Reality |
【推荐3】In an effort to stop poaching (偷猎) and protect endangered species, people are using technology previously created to discover stars. Claire Burke, who led the project, says the application of the starhunting tech has so far paid off big for conservation. “Since animals and humans in thermal imagery (热成像) ‘glow’ in the same way as stars in space, we have been able to combine the technical expertise of astronomers with the conservation knowledge of ecologists to develop a system to find the animals or poachers automatically,” she said in a statement.
In addition to species identification, the software can also provide an overview of health. Burke said that diseased or injured animals give off a different thermal imagery than the healthy ones. “The real advantage this gives you is that if you know how many animals you have and where they are and what kind of health they are in, then you can work out a good conservation strategy for looking after them,” she said.
The following is a post written by Burke on Twitter: More animals for the thermal imagery library. Thanks to Chester Zoo Science @ScienceatCZ for letting us observe their fantastic creatures. Images are giraffes, Indian elephants, and fruit bats.— Claire Burke (@CBurkeSci) October 27, 2017.
To train the software on a wide variety of heat signatures from different species, the team of researchers spent time collecting thermal imagery of animals. Their first field trial to detect Riverine rabbits, one of the most endangered mammals in the world (with only 500 living adults left in the wild), was a complete success. “The rabbits are very small, so we flew the drone (无人机) quite low to the ground at a height of 20 meters (65 feet). Although this limited the area we could cover with the drone, we managed to see the rabbit five times,” said Burke. “Given that there have only been about 1,000 times people have seen Riverine rabbits, it was a real success.”
What is the text mainly about?
A.Technology has helped a lot in helping the endangered animals. |
B.Scientists use stargazing tools to protect endangered species. |
C.What we should do to protect the endangered animals. |
D.Scientists are working hard to protect the environment. |