On a recent summer afternoon in Tashkent, capital of Uzbekistan, there were very few people on the streets, and traffic was relatively light. Such a sight hardly showed any sign of a rapidly shifting global geo-economic landscape.

Yet, a closer look revealed a very interesting dynamic: While a vast majority of the cars on the streets are older sedans carrying the golden cross logo of US carmaker Chevrolet, newer, futuristic ones are often new-energy vehicles (NEVs) produced by Chinese carmaker BYD. The slogan - Build Your Dream - was a distinctive feature on the back of each BYD cars.  

Such a dynamic is expected to become even more significant not just on the streets of Tashkent, but also those of other cities around the world. Last month, BYD and Uzbekistan signed an investment agreement to build a factory for NEVs in the country. Globally, China has become the world's biggest auto exporter and 60 percent of the world's total NEVs are produced and sold in China. 

The rapid rise of China's NEV sector globally is a microcosm of the success of China's industrial upgrade and high-quality development. Recently, as some indicators fell short of sky-high expectations for China's economic recovery this year, some Western officials and media outlets continue to relentlessly hype up the short-term fluctuations in an attempt to smear the Chinese economy. However, such smear completely ignores the achievement of China's industrial upgrade and its pursuit of high-quality development - which has not only seen major progress but also shown vast potential for long-term, sustainable growth that will contribute greatly for the world economy, Chinese officials and economists said. 

Still, China's NEV industry did not rise to its global leading position without a lot of hard work and focus. Industrial transformation and upgrade often come with pain. At a ceremony marking the production of the 5 millionth NEV, Wang Chuanfu, founder of BYD, choked up a few times, as he recalled the hardships the company has faced over the years, including facing bankruptcy at one point. BYD is hardly the only Chinese company that has faced and ultimately overcome such hardships. 

SAIC Volkswagen, a Chinese-German joint venture, represents a typical case. The company had been the industry leader for years in the field of fossil fuel cars. But in 2018, as sales of traditional fossil fuel cars plunged, China's auto industry saw its first ever negative growth, and SAIC also saw major drops in sales and profits. The company started its transition toward NEVs.

"Market choice has pointed toward a clear path. Even if there will be pain, we must closely follow the NEV trend," an executive from SAIC was quoted as saying by the People's Daily.

With that, the company shut down a 40-year-old factory, and invested 17 billion yuan in building a new plant that can produce 300,000 NEVs annually. The company also stepped up spending in research and development (R&D), with industry leading investment despite financial challenges. The result: Starting in July, sales of the company's ID NEVs surpassed 10,000 units for two consecutive months, leading sales of other NEVs produced by joint ventures. And the company continues to invest heavily in NEVs in the second half of 2023. 

Such successful stories of transformation are shared by many other Chinese carmakers. Together, they represent the rise of China's auto industry, with leading production, sales as well as innovations. And the rise of China's industry also reflects China's overall industrial transformation and upgrade, which often encounters challenges but ultimately translates into high-quality development - the central goal of the Chinese economy. 

In a speech at a reception to celebrate the 74th anniversary of the founding of the People's Republic of China on September 28, Chinese President Xi Jinping stressed that to achieve high-quality development, the country must fully and faithfully implement the new development philosophy in all aspects, and accelerate the development of a new development paradigm. Xi also pointed out that the economic recovery is picking up pace, contributing to the steady advancement of high-quality development, the Xinhua News Agency reported.

Comprehensive view on GDP 

In the first half of 2023, China's GDP grew by 5.5 percent, prompting many speculations and even dire predictions about the Chinese economy.

Is such a growth rate high or low? To answer this question, a comprehensive look at the new addition and the quality of growth, instead of just speed, is necessary. 

"As the world's second-largest economy, a 1 percent growth today is vastly different from that of the past in terms of absolute increment," said Wang Xiaosong, a professor of economics at Renmin University of China in Beijing. In 2022, China's GDP stood at about $18 trillion, the increment from a 1 percent growth rate is equivalent to that of 2.1 percent growth rate 10 years ago - and that of 5.3 percent growth rate in India. 

Moreover, a 5.5 percent growth rate is faster the 3 percent growth rate in 2022 and the 4.5 percent growth rate in the first quarter of 2023 and is the fastest growth rate among major economies. The growth rate is also in line with China's official growth target of about 5 percent in 2023. While many had expected a restorative economic recovery in China, the fact is that over the past three years, the global economy has been deeply troubled by the COVID-19 pandemic and the still ongoing Ukraine crisis. Like the world economy, China's economy also goes through a recovery process and a 5.5 percent growth rate is hard-won.

"You can't expect an athlete to break the 100-meter sprint record, while his body is still recovering," said Wang Changlin, vice president of the Chinese Academy of Social Sciences, told the People's Daily.

In terms of quality, the 5.5 percent growth rate in the first half of 2023 was led by consumption and investment, instead of investment and exports in 2022. It was also driven by innovation and new growth models. In the first half of the year, the added value of information transmission, software and information technology services jumped by 12.9 percent, while online retail sales of physical goods grew by 10.8 percent. The real growth rate of per capita disposable income of residents across the country was 5.8 percent, significantly faster than that of 2022. China has not just achieved stable growth but also ensured the security of food, energy and industrial and supply chains. 

"One of the highlights of China's economy this year is that the security and sustainability of economic development have been significantly enhanced," Wang Xiaosong said, noting that China's economy is currently very resilient and will continue to maintain the healthy and stable growth.

While some headline figures for areas such as exports, investment, employment and corporate profits were less than impressive, there are also many highlights. In the first half of the year, China's exports to countries participating in the joint construction of the China-proposed Belt and Road Initiative saw a double-digit growth, combined exports of NEVs, lithium batteries and solar cells jumped by 61.6 percent. In the first eight months, China's auto exports soared 104.4 percent, and ship exports increased by 28 percent. 

"With the continued effect of a series of policy measures, we have the confidence, foundation and conditions to achieve the goal of promoting stability and improving the quality of imports and exports," said Lü Daliang, a spokesperson with the General Administration of Customs, during a press conference in July. 

In terms of investment, in the first half of the year, total fixed-asset investment increased by 3.8 percent year-on-year, with private investment dropping 0.2 percent. However, excluding real estate investment, private investment jumped by 9.4 percent during the same period. China has also taken a slew of measures to stabilize the real estate market. 

Vast potential

"Based on international experience, after an economy reaches a certain scale, industrial upgrading and transformation and development are generally accompanied by short-term slowdown. While accelerating structural adjustment, transformation and upgrading, China's economy has achieved effective qualitative improvement and reasonable quantitative growth, which is extremely difficult," Yang Changyong, a senior researcher from the Chinese Academy of Macroeconomic Research, told the People's Daily. 

Yang said that the Chinese economy can make new breakthroughs and reach new heights if the advantages of the vast domestic consumption are fully leveraged, greater efforts are made in adjusting growth models and structures and boosting growth engines, and a powerful and resilient domestic economy is established. 

China also has the institutional advantage of being a socialist market economy, sufficient macro policy tools and adjustment room, and abundant means and measures to prevent and tackle risks, which ensures long-term stability of the Chinese economy despite challenges, according to Wang Changlin.

The bright prospect of China's high-quality development is also reflected in the steadfast efforts by companies such as BYD and SAIC Volkswagen to transform and innovate. With their advanced technologies and high-quality products reaching every corner of the globe, the world will feel and benefit from China's high-quality development. 

Wu Qiuyu, Zhao Zhanhui and Liu Shiyao are People's Daily reporters; Wang Cong is a Global Times reporter.

Seventy-five days after having returned to the ground, the Shenzhou-14 crew members met the press on Friday and were in good spirits. They were also in good physical and mental shape, said health experts at the press conference, noting that they have now moved into the recovery observation stage and will be able to return to normal soon.

The recovery of normal body function for the taikonauts after they returned from space consists of three stages - quarantine, convalescence and observation - according to health experts speaking at the press conference on Friday.

The Shenzhou-14 crew has completed the first two stages, showing a stable emotional status and good mental condition, and their body weight has stabilized at pre-flight level. The muscle strength, endurance and cardiorespiratory reserves have been further restored, achieving the expected results.

They have now moved into the third stage of recovery observation. After an overall evaluation, the three taikonauts will be able to return to normal training and work.

After concluding their six-month stay at the China Space Station and completing the first direct handover in orbit in the country's history, Chen Dong, Liu Yang and Cai Xuzhe, the three taikonauts of the Shenzhou-14 safely returned to Earth on December 4, 2022.

It marked the first return mission after the completion of the China Space Station's T-shape basic structure.

Construction on China's first deep-sea multi-functional scientific investigation and cultural relic archaeological vessel officially began in Nansha, Guangzhou, South China's Guangdong Province on Sunday. The ship is expected to be completed and put into operation in 2025, CCTV reported on Monday.

According to the report, the ship has a total design length of approximately 103 meters, a designed displacement of approximately 9,200 tons, a maximum speed of 29.63 kilometers per hour, a reach of 15,000 nautical miles, and can accommodate up to 80 crew members. 

The vessel is a new type of multi-functional scientific research vessel capable of conducting deep-sea scientific investigations and cultural relic excavations, as well as polar sea area investigations in summer. 

The ship has a number of iconic features, including unrestricted waterway navigation, manned diving, deep-sea detection and heavy-duty safety payload capabilities, providing the necessary sample and environmental data for forefront geological, environmental, and biological sciences research in the deep and remote ocean. 

It also provides related discipline guidance and underwater operations support for deep-sea archaeology, while supporting sea trial and use of core deep-sea equipment.

In the future, the vessel will become an open and shared maritime platform for multi-system integration, interdisciplinary crossover, and collaborative innovation in China, which is of great significance for strengthening China's substantial presence in the global deep-sea research, enhancing China's deep-sea archaeological capabilities, and realizing full-scale access to the global deep sea.

Song Jianzhong, a researcher at the National Centre for Archaeology, told the Global Times on Tuesday that the ship would provide solid support for Chinese deep-sea archaeology.

Two ancient ships carrying numerous cultural relics were discovered in October 2022 in the South China Sea at a depth of about 1,500 meters, and are currently undergoing excavation work. 

He Guangwei, deputy chief engineer at the Guangzhou Shipyard International Company Limited, stated that there is currently no ship in China capable of conducting manned deep-sea scientific investigations in polar regions. The construction of this vessel will fill this gap.

This ship is designed to conduct manned deep-sea scientific investigations in polar regions while also being able to carry out cultural relic archaeology and operations in the South China Sea. The ship has many key technologies, including icebreaking capabilities and anti-freezing materials for polar environments, and related operating and detecting equipment for scientific investigations in polar regions.

Many localities have issued policies to encourage state-owned enterprises to play an exemplary role in stabilizing employment and expand recruitment of college graduates, with some provinces and cities requiring no less than half of the hiring quota at state-owned enterprises be dedicated to college graduates.

The office of the Guangdong Provincial People's Government recently published a notice on optimizing and adjusting stable employment policies and measures to promote development and benefit people's livelihood. Showing clear support for state-owned enterprises expanding the scale of recruitment, the notice pointed out that the number of new college graduates recruited by state-owned enterprises in the province this year should be no lower than that of 2022.

Additionally, East China's Anhui Province also issued a notice requiring state-owned enterprises to recruit at least 50 percent of fresh graduates to ensure that the number of college graduates accepted by state-owned enterprises remains stable.

Besides this, the provinces of Hunan, Gansu and Jiangxi have made similar notices. Among them, Central China's Hunan Province requires that provincial state-owned enterprises accept more than 4,700 graduates, while Northwest China's Gansu requires provincial state-owned enterprises to recruit more than 5,000 college graduates in 2023. Meanwhile, provincial state-owned enterprises funded and supervised by the Jiangxi government are set to recruit no less than 5,000 college graduates this year.

The number of college graduates is expected to reach 11.58 million before the end of 2023, an increase of 820,000, according to estimates by China's Ministry of Education. 

South China's Hainan Province proposed in July that state-owned enterprises should play a role in attracting young employees and ensure that no less than 1,000 college graduates are recruited by the end of 2023, while East China's Fujian Province is requiring the implementation of a one-time increase at state-owned enterprises to ensure that the number of college graduates recruited exceeds that of 2022.

An employee at PetroChina's Beijing branch surnamed Li told the Global Times on Sunday that more than 80 percent of new hires at the branch office in 2023 have been graduates. Moreover, a staff member surnamed Zhao with the Industrial and Commercial Bank of China's research and development center in Beijing told the Global Times that the recruitment rate of graduates at the company in 2023 reached 90 percent.

The demand for state-owned enterprises to expand the scale of recruitment is in response to graduate demand and aims to alleviate the current problem of comparatively low youth employment, Xiong Bingqi, director of the 21st Century Education Research Institute in Beijing, told the Global Times on Sunday. 

According to Xinhua News Agency, as of August 11, the number of college graduates recruited by central enterprises and state-owned enterprises under the national asset supervision system has exceeded the same period in 2022. With the summer recruitment of state-owned enterprises gradually underway, it is expected that the recruitment volume will continue to increase in the future.

The State-owned Assets Supervision and Administration Commission of the State Council has also made arrangements for the recruitment of college graduates by state-owned enterprises in 2024 at a meeting held in July.

The meeting required central enterprises and local state-owned enterprises to strive to complete the recruitment plan for the 2024 college graduates by the end of August, and gradually provide a batch of high-quality positions in September and October, in order to identify a group of high-quality target candidates as early as possible.

According to the Xinhua News Agency, as of August 11, the number of college graduates recruited by state-owned enterprises under the national asset supervision system has exceeded the same period in 2022. With the summer recruitment of state-owned enterprises gradually underway, it is expected that recruitment volume will continue to increase in the future.

The State-owned Assets Supervision and Administration Commission of the State Council has made arrangements for the recruitment of college graduates by state-owned enterprises in 2024 at a meeting held in July.

The meeting required central and local state-owned enterprises to strive to complete recruitment plans for the 2024 college graduates by the end of August, and gradually provide a batch of high-quality positions in September and October, in order to identify a group of high-quality target candidates as early as possible.

A fossil from a new species of dinosaur is helping to bridge a crucial 20-million-year gap in tyrannosaur evolution.

The key fossil is a 90-million-year-old, grapefruit-sized partial skull from Uzbekistan’s Bissekty Formation. This tyrannosaur braincase, the first well-preserved one found from the mid-Cretaceous period, shows that, although still small, tyrannosaurs of the time already had brain and ear features of later tyrannosaurs. Researchers have dubbed the in-betweener Timurlengia euotica, meaning “well-eared.” They describe the new species in a paper to appear in the Proceedings of the National Academy of Sciences.
The braincase sheds light on a long-standing mystery: how tyrannosaurs evolved in the gap from 100 million to 80 million years ago from an “average Joe” horse-sized predator in the Early Cretaceous to the huge apex predators they became in the Late Cretaceous. “Our study is the first to show that the sophisticated brain and hearing of big tyrannosaurs evolved in smaller-bodied species, long before tyrannosaurs got giant,” says study coauthor Stephen Brusatte, a paleontologist at the University of Edinburgh. These advantages, he adds, may have helped tyrannosaurs become such successful — and eventually enormous — predators.
Analyzed against a database of other tyrannosaur skulls, the braincase shows that Timurlengia’s brain and ear “are almost identical to T. rex, just smaller,” Brusatte says. In particular, the dinosaur’s long cochlea, a part of the inner ear, is a signature of bigger, badder Late Cretaceous tyrannosaurs. “The long cochlea would have meant better sensitivity to low-frequency sound,” Brusatte explains. That sensitivity would have enabled Timurlengia to detect very subtle or distant sounds, giving the dinosaur clear advantages over other predators.

“Timurlengia fills an important gap in both time and evolution,” says Lawrence Witmer, a paleontologist at Ohio University in Athens who was not involved in the study. “Charles Darwin couldn’t have scripted it any better.”

The next step is to determine if the braincase is typical of a mid-Cretaceous tyrannosaur, or just one oddball data point. “We’ve analyzed the heck out of each scrap of Bissekty tyrannosaur bone,” Brusatte says, “so the thing that could move us forward is the discovery of new specimens in other middle Cretaceous rock units in other parts of the world.”

The mysteries of the Zika virus are slowly but surely succumbing to the scientific method. Last week, scientists revealed the virus’ structure, gleaned further insight into its ties to the birth defect microcephaly and found out just how little some people seem to know about Zika. Public health researchers at Harvard University released the results of a poll related to Zika awareness on March 29, and lots of respondents flunked. In a survey of 1,275 adults, 23 percent were unaware of Zika’s association with microcephaly and 42 percent did not know the virus could be transmitted sexually.

The survey highlights some general confusion about the facts of Zika, and the latest new tidbits show how quickly researchers are learning new things about this virus. So, let’s take a look at what people are saying about Zika and set the record straight .

Yes, in the case of microcephaly, Zika looks very, very guilty. No, pesticides and vaccines do not cause microcephaly.
A few different things, including viruses, can cause microcephaly, a birth defect in which babies have abnormally small heads and brain damage, as Meghan Rosen notes in the April 2 Science News. At the moment, there’s no smoking gun to convict Zika as the perpetrator behind Brazil’s uptick in microcephaly, but it’s not looking good for the virus. In Brazil, more microcephaly cases have appeared in places with more Zika cases. Zika has also been detected in the amniotic fluid, placenta and brain tissue of fetuses with microcephaly. It attacks specific cells related to fetal development. Zika infection during pregnancy has been linked to miscarriages and placental problems, plus other neurological conditions, including the rare autoimmune disease Guillain-Barré syndrome.

WHO officials noted in their March 31 situation report: “Based on observational, cohort and case-control studies there is strong scientific consensus that Zika virus is a cause of [Guillain-Barré syndrome], microcephaly and other neurological disorders.”

The evidence against other suspects is much less compelling. Still, a report by a group in Argentina calling themselves “Physicians Against Fumigated Towns” sent the Internet into a tizzy in February with the claim that the larvicide pyriproxyfen, not Zika, was to blame for microcephaly cases. The WHO has since reviewed toxicology studies and widespread use of the pesticide and found no evidence that the chemical interfered with human pregnancy or development. Similar rumors that vaccines or genetically modified mosquitoes caused Brazil’s microcephaly uptick simply lack any evidence, the WHO says.
Yes, you can get Zika by having sex with an infected person.
Though Aedes mosquitoes serve as the primary vector for Zika, researchers have had suspicions for a while that Zika could be sexually transmitted. In 2008, a U.S. researcher developed Zika infection symptoms after returning home from studying mosquitoes in Senegal and transmitted the virus to his wife through sex. This was the first documented sexually transmitted case of Zika.

Since then, more sexually transmitted cases have emerged in the U.S., as well as in Italy, France, Argentina, Chile and New Zealand. Thus far, only men have transmitted the virus, and whether women can also transmit the virus to their sexual partners is unknown. Researchers suspect that the virus may linger longer in semen than in blood — another potential source of transmission currently being investigated. (On March 30, the U.S. Food and Drug Administration approved a screening test for Zika in blood donatons.) To prevent the spread of Zika between sexual partners, the CDC recommends the usual precautions.

No, there’s no vaccine for Zika, but people are working on it.
There is currently no vaccine against Zika, and vaccines against other viruses from the same family, like yellow fever, do not offer protection against Zika. That said, concern over Zika’s link to neurological disorders and growing case counts in the Americas has jump-started efforts to develop a vaccine. The idea of a chimeric vaccine that could combat Zika and other related viruses like dengue is an attractive research prospect. On March 31, a team reported the virus’ structure in Science, providing potential clues for vaccine development.

Sometimes Zika symptoms are obvious. Sometimes they’re not.
Only 20 percent of the people who get Zika actually notice symptoms. When they do, those symptoms include fever, rash, sore joints, pink eye and muscle pain. Sometimes Zika cases look a lot like dengue and chikungunya — meaning there’s potential for misdiagnosis.

No, sterilized mosquitoes do not increase the spread of Zika. In fact, they could help fight it.
There’s no evidence that sterilized mosquitoes aid and abet the spread of the virus. Some researchers would actually argue that they are our best chance of stopping it, Susan Milius notes in the April 2 Science News. Sterilization, by zapping males with radiation or genetically tweaking them, could reduce and theoretically wipe out a mosquito population. Meanwhile, gene drives likes CRISPR/Cas9 seem poised to make genetic sterilization methods a lot easier, too. Infecting mosquitoes with Wolbachia bacteria also cuts bloodsucker populations. If all else fails, El Salvador is using the tried and true method of deploying fish to eat all the larvae in mosquito breeding ponds. It goes without saying, but none of these control methods actually aid the spread of Zika.

Time to add another gorgeous space photo to the Hubble Space Telescope’s list of greatest hits. For the orbiting observatory’s 26th anniversary in space, astronomers snapped a picture of the Bubble Nebula, a seven-light-year-wide pocket of gas being blown away by a blazing massive star about 7,100 light-years away in the constellation Cassiopeia.

The star responsible for the bubble is young, just 4 million years old, and about 45 times as massive as our sun. It is so hot and bright that it launches its own gas into space at more than 6 million kilometers per hour. The vibrant colors in the nebula represent the elements oxygen, hydrogen and nitrogen.

Hubble launched April 24, 1990, aboard the space shuttle Discovery. A series of visits by astronauts have kept the aging telescope’s suite of cameras, spectrometers and ancillary equipment up-to-date and operating well into its third decade.

Danger in ‘swimming hole’  — As warm weather approaches, the old swimming hole will again beckon boys and girls in farm areas. But disease germs lurk in waters exposed to cattle and other animals…. One “swimming hole disease” called leptospirosis is caused by water-borne Leptospira pomona…. Warm summer temperatures are ideal for maintaining leptospiral organisms in water, and heavy rains may transport the organisms downstream.  — Science News, May 14, 1966

UPDATE
An estimated 100 to 200 people get leptospirosis annually in the United States. The disease, which can cause fever, headache and vomiting, is most common in tropical and rural regions worldwide. Summertime swimming is also haunted by another single-celled terror that thrives in warm freshwater: the so-called “brain-eating” amoeba, Naegleria fowleri. The amoeba caused 35 reported infections in the United States from 2005 to 2014. If N. fowleri enters a person’s nose, it can travel to the brain, where swelling triggered by the immune system kills most victims (SN: 8/22/15, p. 14).

In many realms of science today, “statistical wisdom” seems to be in short supply. Misuse of statistics in scientific research has contributed substantially to the widespread “reproducibility crisis” afflicting many fields (SN: 4/2/16, p. 8; SN: 1/24/15, p. 20). Recently the American Statistical Association produced a list of principles warning against multiple misbeliefs about drawing conclusions from statistical tests. Statistician Stephen Stigler has now issued a reminder that there is some wisdom in the science of statistics. He identifes seven “pillars” that collectively provide a foundation for understanding the scope and depth of statistical reasoning.
Stigler’s pillars include methods for measuring or representing aggregation (measures, such as averages, that represent a collection of data); information (quantifying it and assessing how it changes); likelihood (coping with probabilities); intercomparison (involving measures of variation within datasets); regression (analyzing data to draw inferences); design (of experiments, emphasizing randomization); and residual (identifying the unexplained “leftovers” and comparing scientific models).

His approach is to identify the historical origins of these seven key pillars, providing some idea of what they are and how they can assist in making sense of numerical data. His explanations are engaging but not thorough (it’s not a textbook), and while mostly accessible, his writing often assumes a nontrivial level of mathematical knowledge. You’ll have to cope with expressions such as L(Θ)=L(Θ)|Χ and Cov(L,W)=E{Cov(L,W|S)}+Cov(E{L|S}, E{W|S}) every now and then.

While Stigler defends statistics from some of the criticisms against it — noting, for instance, that specific misuses should not be grounds for condemning the generic enterprise — he acknowledges that some issues are still a source of concern, especially in the new era of “big data” (SN: 2/7/15, p. 22). Using common statistical tests when many comparisons are made at once, or applying tests at multiple stages of an experimental process, introduces problems that the seven pillars do not accommodate. Stigler notes that there is room, therefore, for an eighth pillar. “The pillar may well exist,” he writes, “but no overall structure has yet attracted the general assent needed for recognition.”

Overuse of antibiotics in livestock can spread drug-resistant microbes — via farm workers or even breezy weather. But there’s more than one reason stay upwind of drugged cattle.

Dung beetles (Aphodius fossor) make their living on cattle dung pats, which are rich in nutritious microbes. To investigate the effects of cattle antibiotics on this smaller scale, Tobin Hammer of the University of Colorado at Boulder and his colleagues studied the tiny communities around tetracycline-dosed and undosed cows. Compared with untreated cows’ dung, microbes in dung produced by treated cows were less diverse and dominated by a genus with documented resistance, the researchers report May 25 in the Proceedings of the Royal Society B.

Beetles typically reduce methane gas wafting off dung, but pats from treated cows showed a 1.8-fold increase in methane output. How this might figure into greater cattle methane production remains to be studied, but Hammer and company speculate that the antibiotics may wipe out the bacterial competition for microbial methane factories.