3 . The Monarch butterfly (帝王蝶) population has dropped to its second-lowest number on record in Mexican forests this winter. The forests are the insects’ winter home. The population decrease is worrying as the butterfly group is already considered at risk of disappearance.

Mexico’s government and the non-profit World Wildlife Fund (WWF) recently issued findings of their yearly joint study on the butterflies. The research shows that the Monarch butterfly presence has decreased to less than a hectare (公顷) of forest area. In the mid-1990s, Monarch butterflies could be found on around 18 hectares of the forests. The findings represent an almost 60 percent decrease in the Monarch butterfly population compared to last year’s study. It is also the second-lowest population finding since the first study took place more than thirty years ago.

Biologists blame the drop on higher-than-usual temperatures and dry conditions in the northwestern U. S. where the butterflies lay eggs. The weather conditions affect the growth of milkweed, the plant where the butterflies lay their eggs. When the young arrive, milkweed is their food for a time. In one of the planet’s famous wildlife migrations (迁徙), the butterflies travel south as many as 4,500 kilometers from places as far north as Canada. They spend the winter in warmer Mexico, where millions of the insects stay in trees that protect them from the rain and cold.

Monarch butterfly populations change year to year. As recently as 2021, the same study showed a 35 percent increase to cover around 2.8 hectares. Officials and activists called for more action to help the species. Such calls include the need to reduce threats of destroying milkweed and the need to protect forests. “We can’t lower our guard,” Jorge Rickards, head of WWF’s Mexico office, told reporters after releasing the latest data.

5 . Vast lands of America are dominated by corn, nearly 100macres of it, stretching from Ohio to the Dakotas. What once was forest today produces the corn that feeds people, cattle and, when made into ethanol (乙醇), cars.

Now, the nation’s airlines want to power their planes with corn, too. United Airlines signed a deal with a Nebraska ethanol company to buy enough sustainable fuel, to power 50,000 flights a year. The government could decide on its tax incentives (税收激励) for the industry as soon as December. “Mark my words, the next 20 years, corn farmers are going to provide 95% of all the sustainable airline fuel,” President Biden said in July.

The airlines’ ambitious goal would likely require nearly doubling ethanol production, which airlines say, with great expectation, would decrease their greenhouse gas emissions. If they succeed, it could transform America’s Corn Belt, stimulating farmers and ethanol producers, but potentially further damaging one of the nation’s most important resources: groundwater.

Corn requires a lot of water to grow and it can take hundreds of gallons to produce a single gallon of ethanol. But as airlines take the idea of ethanol, the vital groundwater faces serious risks. “We’re on track to massively increase water usage without any real sense of how sensitive our groundwater is,” said Jeffrey Broberg, who is concerned about groundwater in Minnesota, a major corn state.

The Department of Energy said in a statement that “water use is a critical part of the conversation surrounding bio-energy sustainability”. It pointed to a 2022 department study that concluded that the United States could significantly reduce pressure on groundwater by shifting fuel production away from water-intensive crops like corn, instead growing more crops that don’t require irrigation (灌溉), like various types of straw, grasses and trees. Hopefully, a better approach will be soon studied and adopted.

6 . A forest after a wildfire

Throughout my career, I’ve had many chances to enter various wildfire areas. But I’ve ________ had the opportunity to see the immediate scene after a fire.

So when I ________ into a recently burned forest, my first reaction was the deathly ________ hung in the air. There were no birds, no breeze caught in the leaves of a tree, or animal noises. It felt as if life itself had totally ________ from this place. What was even worse, the burned-out forest meant that a large amount of ________ alongside the road was no longer ________ by the under-growth (灌木丛) . Oil cans, glass, plastic bags—you name it, and you can find it.

Knowing there was a story here that needed ________ , I raised my camera with a heavy heart, no matter how ________ . Photographing burned-out areas is ________ , since there is really only a bunch of burned-out wood. Through my lenses, I sought to connect viewers to the ________ of the disaster.

For a nature photographer passionate about environmental protection, it’s important to ________ the ugly as well as the beautiful. We need to put those two things together, so while ________ hope, we are aware of what has been taken from us, and how ________ that loss can be. Without that balance, we risk becoming used to a world shaped by destruction and not the one of ________ . Nature will regenerate, but now, we must consider what ________ we humans play in that process, too.

7 . In the rich countries of the West, the electric vehicle revolution is well underway. Climate-conscious consumers drive Teslas or Polestars for reasons of morality and fashion. Poorer countries are also experiencing a wave of electrified trend. In Bangladesh, electric three-wheeler taxis, known as tuk-tuks, are rapidly replacing gas-powered ones on the streets. Such electric vehicles are climate friendly, cost effective, and help reduce air pollution.

Yet a glance under the hood (引擎盖) of these vehicles reveals a poisonous secret: each tuk-tuk runs on five massive lead-acid batteries, containing almost 300 pounds of lead in total. Every year and a half or so, when those batteries need to be replaced and recycled, about 60 pounds of lead leak into the environment. Battery recycling, often at small-scale unregulated factories, is a highly profitable but deadly business.

Lead is dangerous, and any exposure to it is harmful to human health. Lead that has entered the environment hurts people on an extraordinary scale. The numerous ways lead enters air, water, soil, and homes across the developing world — and the enormous damage it does to human health, wealth, and welfare — causes one of the biggest environmental crises in the world yet receives little attention.

The World Bank estimates that lead kills 5. 5 million people per year, which would make it a bigger global killer than AIDS, malaria, diabetes, and road traffic deaths combined. On top of the shocking deaths, the social burden of lead poisoning is extraordinary, as is its contribution to global inequality — our research on the cognitive effects of lead poisoning suggests that it may explain about one-fifth of the educational achievement gap between rich and poor countries.

But unlike many challenges faced by developing countries, lead poisoning is a problem that is fixable with some attention and a relatively modest financial investment. Better monitoring, research, and rules can help protect children all over the world from the dreadful effects of lead poisoning and reduce the massive global costs it brings.