2 . From airplanes to apartments, most spaces are now designed with sound-absorbing materials that help decrease various sounds of everyday life. But most of the sound-absorbing materials that can cancel out human voices, traffic noise and music are made from plastic foams (泡沫) that aren’t easily recycled or degraded. Now, researchers reporting in ACS Sustainable Chemistry & Engineering have created a biodegradable film (薄膜) obtained from seaweed, which effectively absorbs sounds in this range.

Controlling and optimizing the way sound moves throughout a room is the key to creating functional spaces. Foam sound-absorbing panels are a common solution, and they come in a variety of materials and thicknesses tailored to specific sound requirements. Most of these foams, however, are made from a type of plastic material and other chemical substances that are obtained from natural oil or petrol. To avoid petrochemicals, researchers have explored more renewable sources and biodegradable sound-absorbing alternatives. But many current options are made from plant fibers that don’t effectively decrease noises in the most useful range of sound frequencies, or they are too thick or difficult to produce. So, Chindam’s team wanted to develop a biodegradable material from a plant, which would be simple to produce and could absorb a range of sounds.

The team created films of agar (琼脂), a material that comes from seaweed, along with other additives developed from plants and varied the thickness of the films. After running the materials through a battery of tests, the researchers measured how well the films reduced sound across a range of frequencies. To do this, the team created a sound tube in which a speaker is placed at one end, and the test film is fitted over the other end. Microphones in the middle of the tube measured the amount of sound sent by the speaker and the amount of sound reflected off the film. These experiments showed that the films with many small holes made with the highest concentrations of agar had the greatest sound-absorbing qualities and performed similarly to traditional sound-absorbing foams. The researchers plan to explore ways to change the agar films to give them other desirable properties, such as flame resistance, and will explore other biologically obtained film materials.

3 . Chaudhary weaves (编织) together lengths of rope and grass collected from the nearby riverbank in her village, skillfully shaping the materials into a gift box while instructing a group of women to follow suit.

The ropes being used were once the lifeline for mountain climbers tackling Nepal’s mountains and were then cast away. Diverse measures to remove such discarded materials have rocketed since 2019, when the government launched Clean Mountain Campaign.Around 140,000 tons of waste were collected on Mt. Everest alone, which were handled accordingly, either securely buried or recycled.

Some waste is now finding fresh life, transformed by skilled hands like Chaudhary’s into items to sell, thanks to an initiative led by Acharya, an owner of a waste processing business and an advocate for sustainable waste management. She has been working with the cleaning campaign, aiming at mountains like Mt. Everest.

“Metal waste goes through the recycling process, but we weren’t capable of recycling these ropes and cooking gas cans,” Acharya says. It didn’t occur to her that the waste which couldn’t be recycled could be reused until she met Rai at an art exhibition and a solution emerged.

Rai, a businessman dealing in craftworks, helped connect Acharya with Chaudhary and her team of craftswomen in hopes of unlocking the economic value of the mountain waste. With flexible hours, the project gives the craftswomen an opportunity to earn money even as they maintain their household responsibilities.

“While this seems insignificant compared to waste in the mountains, it’s a start. We can’t supply sufficient raw material with waste sorting and cleaning processes taking plenty of time and money,” Acharya says, desperate to expand the program to involve more women and treat more waste. But progress has been slow. “We need investment to mechanize the cleaning and processing of waste in the initial phase to provide the crafting team with enough materials to meet their demand,” she adds.

4 . It may come as a surprise that the fashion industry is one of the most polluting industries in the world, especially when it comes to carbon emissions and water usage.     1     Clothing production releases 10% of worldwide carbon emissions. Although cotton is often offered as a more sustainable material, one cotton shirt requires 2, 700 liters of water to make, which is enough for one person to drink eight cups per day for 2.5 years.

    2     However, it’s undeniable that sustainable companies like Reformation and Organic Basics are out of most people’s price ranges. Fast-fashion clothing companies have the advantage of low prices, and when it comes down to it, most people will choose low prices over sustainability. So, how can people buy sustainable clothing when it’s not affordable?    3    

Actually, there are other ways to practice sustainable habits. Of course, the best way to limit waste is to not buy any new clothes. For example, saving up to buy more sustainable clothes and then wearing them for many years is healthier for the environment and your wallet.     4     Then you can combine them with your statement pieces to get a variety of new outfits that still feel stylish and don’t generate waste. Certainly, buying second-hand clothing is also a great option.

With ever-changing fashion trends moving at breakneck speed, consumers are easily persuaded into buying latest designs to stay stylish and sustainable.     5     Honestly, it’s unnecessary. Wearing what makes you feel confident will make you look good, and the earth will thank you for your efforts.

7 . Two thirds of the ice in the glaciers (冰川) of the Alps is doomed! These glaciers will melt by the end of the century as global temperatures rise, according to a recent study.

Scientists claim that half the ice held in some 4,000 Alpine glaciers will disappear by 2050 due to global warming through the effect of past emissions. After that, even if carbon emissions drop to zero, two-thirds of the ice will still have melted by 2100. If emissions continue to rise at the current rate, the ice tongues will have all but disappeared from Alpine valleys by the end of the century. The most pessimistic prediction tells us that the Alps will be mostly ice-free by 2100. Only isolated ice patches would remain at high altitudes, representing five per cent, at most, of the ice volume seen today.

The researchers warn that the loss of these glaciers will mean much less water is available for farming and hydroelectricity, especially during droughts. It would also affect nature and tourism.

In February, a study found that a third of the huge ice fields in Asia’s towering mountain chains were also under threat for the same reasons. This will lead to serious consequences for almost two billion people who live downstream. Glaciers along the Hindu Kush and Himalayan range are at higher, colder altitudes. If global carbon emissions are not cut, however, two-thirds of their ice could be gone by 2100.

The latest research combined computer models with real-world data to forecast the fate of the glaciers. It used 2017 as its starting point. Unlike previous work, these models included how the glaciers move down the mountains. Applying this approach to other glaciated mountain chains could improve ice loss forecasts there.

Cutting the emissions from fossil-fuel burning, deforestation and other polluting activities is the biggest factor in minimizing the melting of the ice. The future of these glaciers is indeed at risk, but there is still a possibility of limiting their disappearance.

9 . 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.”

10 . Damon Carson calls himself a matchmaker (媒人) of the never-ending waste of American society, trying not to pair people with people, but things with people.

In the late 1990s, Carson was on break from business school in Vail, Colorado, when he discovered the vast world of waste. He began thinking about creating a secondhand store that would sell old materials and keep them out of being wasted. As a result, in 2010, his company, Repurposed Materials appeared.

For nearly ten years, his company, Repurposed Materials, has not been looking to recycle the waste he gets — breaking it down to make something new — but rather finding new homes for thrown-away goods in their original forms.

Carson, a husband and father of three adult children, is far from wasteful. Frugal is how he describes himself. The clothes he’s wearing all came from a charity shop; his truck was bought with 290, 000 kilometers driven.

“Why break something down, why melt something down, if it still has value?” he asks. An old oil-field pipe might be melted down and turned into a car bumper, but it still takes an amount of power to finish the complete change. Why not leave it as a steel pipe? Why not turn it into a fence post on a farm? The only cost is transport.

American industrial facilities create and throw about 7.6 billion tons of unwanted industrial materials every year. For the moment, Carson’s unique business finds new lives for millions of kilograms of industrial waste every year.