1 . Solar farms offer one way to meet the world’s decarbonization targets, but they could also be used to deal with another of the planet’s big problems: loss of biodiversity. The approach is starting to take off. Residents of Barnsdale, for example, will soon play host to a new solar farm lined with grass field of wildflowers and native grasses, which Banks Group, the developer, says will promote pollinating insects.

The idea comes from the combination of two long-term trends: declining numbers of pollinating insects and the growing amount of land distributed to solar farms. According to the Center for Biological Diversity in Arizona, more than 40 percent of insect pollinators globally are listed as “highly threatened”—an issue that could seriously threaten food security. Meanwhile, solar-energy competence has been increasing. Matthew O’Neal, a scientist at Iowa State University, would like to see more solar developers seize this opportunity.

The benefits of such projects don’t stop at the insects. Research from Yale’s Center for Business and the Environment indicates that pollinator-friendly solar farms can raise crop output on nearby farmland, increase the recharging of groundwater and reduce soil erosion. In 2018, a US Department of Energy study found that if all existing and planned solar facilities near soybean and cranberry crops included pollinator home and increased output by just one percent, annual crop values could rise by US $1.75 million, US $4 million and US $233,000, respectively.

“Farmers could identify unprofitable areas, such as poor, highly erodible lands, as candidates for a pollinator-friendly solar farm. There’s the potential to increase their net income with pollinator motivation projects,” says O’Neal.

With enough forward thinking, these studies show, clean energy can provide new environmental opportunities. “We’re at a turning point with energy production and we’re seeing more opportunities to provide extra benefits that wouldn’t have been considered with older methods of energy generation,” says O’Neal. “You never heard of a coal mine planning pollinator conservation.”

2 . Around the world, people are realizing the significant problems caused by plastic waste. In the last 65 years, we have become increasingly dependent on plastic. It’s easy to understand why: it’s cheap to produce, light — therefore easy and cheap to transport — and incredibly strong and durable.     1    

One popular solution to the problem is to prohibit single use plastics. In the British supermarkets, shoppers are encouraged to make more environmentally-friendly choices in packing and transporting their food.     2     Some governments have even promised to ban the use of single-use plastic altogether by the not-too-distant future.

However, such plans may not be beneficial to eliminate (消除) the use of single-use plastic altogether.     3     This is not just because of its low cost. It’s also because infection and cross-contamination (交叉感染) are minimized. Plastic packaging is also crucial in the food industry. It ensures that food is safe for consumers.

Another issue is that alternative materials to plastic are often more environmentally harmful than plastic. Take paper bags, for example.     4     The process requires cutting trees, the emission of greenhouse gases and the production of poisonous chemical waste. Even more pollution is created when paper bags break down.

Clearly there is a need to reduce plastic waste and its impact on the environment.     5     Industries that rely on single-use plastics for people’s health and safety must be considered. Moreover, alternative materials must be evaluated strictly regarding their own environmental impact.

3 . Macquarie Island is a tiny island that’s part of Australia. It’s about halfway between New Zealand and Antarctica. The island’s been made a world heritage area because it’s so untouched, but this unique environment is under threat from some unwanted visitors.

It all started when seal hunters came to the island in the early 1800s. They brought rabbits with them as a source of food for the journey, and also on board the ships were rats and mice, which made their way onto the island too. They’re being blamed for destroying the homes of marine birds, causing soil loss and ripping up plant cover, as these before-and-after photos show.

So what’s being done about the problem? It starts with a team of helicopters that fly across the island carrying these giant containers. Inside them are poisoned pellets (有毒饲料) which are dropped and spread across the island. For any rabbits that survived the baiting (诱饵) , there’s a plan B. This special team of dogs is being put through a final training. It’ll be their job to track down any remaining rabbits. They have to also learn to behave around the island’s native wildlife. The dogs could be here for years or until the task is complete. The dogs don’t actually kill the rabbits. They find them, then the hunters decide to either catch the rabbits or shoot them.

But the program has received a bit of criticism. Some people argue 25 million dollars is a lot of money to be spending on wiping out rabbits and rodents (啮齿目动物), and in the process, some native birds will be killed because of the baiting.

The reality is the problem isn’t going to be solved overnight. The people running the program say that even if one pair of rabbits is left alive, the whole task will be seen as a failure, which means these guys could be here for a long time, trying to ensure that this precious island remains protected from pests.

4 . In the 1970’s, people who managed ponds had a problem with plants and snails in the water. To control the pests, the managers brought four species of carp, a type of fish, from Asia. But some of the fish escaped into rivers and other waterways. Soon, there were lots of fish. And they became troublesome invasive species. These non-native fish can bully ecosystems, quickly taking over. Growing fast and big, they ate lots of the food on which the native fish would normally depend. Bighead carp are an invasive species in the United States. Binbin Wang is using a combination of computer modeling and field experiments to study how the eggs of these and other invasive carp could be transported in the Missouri River.

Today, the descendants (后代) of those carp remain a big problem. And as the fish spawn (产卵), their eggs have been drifting (漂流) far and wide. Anticipating where something will drift can be a challenge. But finding answers may handle the crisis.

At the University of Missouri in Columbia, civil and environmental engineer Binbin Wang is working to figure out where eggs of the invasive fish are spreading in the Missouri River. If science can get ahead of the problem, there’s hope that people may figure out how to stop it. But if science is too slow to answer this question, legions of carp eggs will grow into adults that out-compete their neighbors. Stopping their spread would help reduce the overall damage they cause.

Drifting may seem somewhat random, but scientists are doing researches to make useful predictions possible. Some of these drift detectives want to know if large icebergs threaten offshore oil platforms. Others hope to track the polluted air or water-and determine where they’re coming from. The work is challenging. It also can be very rewarding. Most importantly, their findings may point toward solutions for some important environmental threats.

5 . Meat is crucial for feeding the planet, leading scientists have said, as they warned it is not more environmentally-friendly to go vegan (素食).

Prof. Geoff Simm, Director of Global Academy Agriculture and Food Security at the University of Edinburgh, said, “I think livestock (家畜) farmers do feel they are being demonized (妖魔化).” Often the argument is made that going vegan would minimize land use, but the modelling studies that have been done demonstrate that’s not the case. We feel that while livestock production has a range of economic, social and environmental costs and benefits, the costs have perhaps been receiving far more attention recently than some of the benefits. Meat has massive social benefits. It’s an important source of dietary protein, energy, highly bioavailable micronutrients (微量营养素), even small amounts of animal-sourced food have a really important effect on the development of children, in the developing world on their cognitive and physical development and they are really important.

Prof. Mike Coffey, from Scotland’s Rural College, added, “It’s completely unnecessary to go vegan. If everybody went vegan it would be devastating for the UK environment. Animals bred for food help boost biodiversity.”

Researchers are currently attempting to breed more environmentally friendly cattle, which grow faster and eat less, which could further reduce the sector’s carbon footprint by reducing the amount of methane (甲烷) released by cows.

Prof. Coffey said that the difference in methane emissions from best and worst cattle was about 30 percent and that if all UK farmers used the most efficient animals this could reduce carbon emissions by nearly a third. But Prof. Coffey said the next stage will be trying to measure the methane given off by different breeds of cattle to find which are the lowest emitters. Prof. Coffey said that soon shoppers could be able to check meat labels to find out how much environmental impact their food has had. He added, “My expectation is that at some point in the near future there will be product labels that relates to the efficiency or carbon impact of the food.”

Professor Andrea Wilson, also of Edinburgh University, said more research was needed into the impact of veganism (绝对素食主义). She added, “We know a lot about the livestock sector because people have looked at it. We actually know very little about the vegan sector. The danger is we demonize one and jump too quickly to the other.”

9 . Around the globe far more bird species are losing ground than gaining, according to an expansive review of a half-century of bird population research published in the journal Annual Review of Environment and Resources in May.

The review, entitled The State of the World’s Birds, showed that more than 5,200 different species of birds-just shy of half the world’s total-are known or suspected to be declining. Around 3,800 species are relatively stable, and fewer than 700 species show increases. Among birds on the IUCN Red List of Threatened Species, almost 400 birds worldwide have had their conservation status changed for the worse in the past three decades (moving from vulnerable to threatened, or threatened to endangered) — five times more than the number of bird species with an IUCN status that has changed for the better.

“After documenting the loss of nearly 3 billion birds in North America alone (according to a 2019 study published in the journal Science), it was disturbing to see the same patterns of population declines and extinction occurring globally,” says review coauthor Ken Rosenberg, a conservation scientist now retired from the Cormell Lab of Omithology.

The review points to disappearing and degraded habitat-resulting from climate change, urbanization, agricultural intensification, and international trade-as the leading driver of bird declines worldwide. In a note of hope, the authors cite a 2020 study indicating that restoring just 5% of habitat in priority areas around the world could avert 60% of likely extinctions.

Lead author Alexander Lees, a research associate at the Cormell Lab, also points to the need for substantial changes in human behavior to prevent further losses. “Loss and degradation of habitat is often driven by demand for resources,” says Lees. “We need to better consider how commodity flows such as beef, oil, and seed crops can contribute to biodiversity loss and try to reduce the human footprint on the natural world.”