If you spend some time wandering through the Prairie wilderness, chances are that you’ll hear the snort of wild pigs, one of Canada’s most invasive species,     1    （original）introduced from Europe in the 1980s to diversify local livestock production. Wild pigs have exploded     2     number. Many of them either escaped from their farm     3     were set free on purpose. They have the potential to rapidly spread diseases, spoil crops and destroy natural vegetation in the course.

To make matters     4    （tricky）, they are highly adaptive and tough enough to survive freezing Canadian winters and often spend summers feeding on anything they can find, including farmers’ crops. Researchers say their living area     5     （grow）by many times over the last decade.

Environmentally, the rapid spread of the wild pigs pose numerous problems such as diversity     6    （lose）and a natural ecosystems change. African Swine fever, an incurable disease     7     has never been found in Canada,     8    （consider）the biggest risk.     9     outbreak of the fever would have a negative impact on the Canadian pork industry.

Hunting may seem like a quick solution, but     10    （fire）a gun at the pigs would only make the problem worse. As they’re very intelligent, they will become more cautious of human presence.

3 . Johannes Fritz, an Austrian biologist, needed to come up with a plan again if he was going to prevent his rare and beloved birds from going extinct.

To survive the European winter, the northern bald ibis needs to migrate south for the winter over the Alps. But shifting climate patterns have delayed when the birds begin to migrate and they are now reaching the mountains too late to make it over the peaks, locking them in an icy death trap. Determined to save them, he decided to teach the birds a new, safer migration route by guiding them himself in a tiny aircraft. He was confident that he could succeed in this daring, unconventional plan.

Some 400 years ago, the Europeans hunted these birds without stopping and devoured the last in the wild, causing the birds to disappear entirely from the wild. When Mr. Fritz was born 56 years ago, the northern bald ibis could be found in Europe only in captivity (圈养).

Mr.Fritz has spent his career reintroducing the birds into the wild. Through years of trial and error, he learned to fly like a bird. He modified (改装) a lightweight aircraft so it would fly at speeds slow enough for the birds to keep up. In 2004, he led the first flock from Austria to Italy, and has since led more migrations. But the route he originally taught the ibises does not work successfully. With climate change warming the area where the birds summer, they now start their migration at the end of October instead of the end of September. The trip is expected to take about six weeks, “Still, we’re optimistic that it’ll work,” said Mr. Fritz.

His family and colleagues witnessed the risks he was taking. “But the unavoidable risks are necessary,” Mr. Fritz said. “It’s not so much a job, but my life’s purpose.”

5 . An Indonesian librarian is lending books to children in exchange for trash they collect in a novel way to clean up the environment and get the kids to read more.

Each weekday Raden rides her three-wheeler with books piled up at the back for children in Muntang village to exchange for plastic cups, bags and other waste that she carries back. She told Reuters she targets to promote reading in the kids as well as make them aware of the environment. As soon as she shows up. little children, many accompanied by their mothers, surround her "Trash Library" and clamour for the books.

They are all carrying trash bags and Raden's three-wheeler quickly fills up with them as the books fly out. She's happy the kids are going to spend less time on online games as a result.

Kevin, a keen 11-vearold reader, searched for waste lying in the village. "When there is too much trash, our environment will become dirty and it's not healthy. That's why I look for trash to borrow a book," he said.

"Let us build a culture of literacy（识字）from young age to reduce the harm of the online world." Raden said, "We should also take care of our waste in order to fight climate change and to save the earth from trash "

She collects about 100 kg of waste each week, which is then sorted out by her colleagues and sent for recycling or sold. She has a stock of 6,000 books to lend and wants to take the mobile service to neighbouring areas as well.

Raden said: "The literacy rate for above-15-year-olds in Indonesia is around 96 percent, but a September report by the World Bank warned that the pandemic will leave more than 80% of 15-year-olds below the minimum reading proficiency level." And she wanted to do her part to make things better.

7 . How can having a childlike view of the world help the environment? Danish eco-artist Thomas Dambo combines a talent for recycling with a fairy-tale imagination to bring people worldwide closer to nature.

For the “Guardians of the Seeds” exhibition, Danish eco-artist Thomas Dambo built five trolls from discarded wood materials, which were appointed by Coastal Maine Botanical Gardens (CMBG) for its splendid riverside woodland.

The exhibition composed of the five trolls aims to give visitors an emotional connection with nature that will encourage them to become keepers of it. For the exhibition, Thomas came up with a story that a family of trolls hid 10 golden seeds to protect the old forest. Using a map that's provided, visitors follow clues to find where the seeds are hidden.

Besides using carefully selected recycling materials to produce his works, to challenge himself creatively, the artist allowed for a degree of production on-site. He gave a skinny troll named Birk a beard made from the roots of fallen trees. The fur of another troll Roskva is made from bark. Also, Gro, sitting with her eyes closed in a yoga pose, has a tongue made out of a nearby deserted planter.

“Thomas wants people to interact with them,” says Gretchen, president of CMBG. “He wants it to be a journey of discovery where you're walking along and all of a sudden this big magical being appears in front of you. These are friendly, happy trolls. They're not scary, mean trolls.”

Thomas hopes that “Guardians of the Seeds” gives viewers the same joy he gets from an occupation that he compares to a hobby. He says too many people lose their playfulness in their adult life. The key quality of his work is just its playfulness. One of his trolls sits on a real car on a hillside, appearing to cheerfully ride it. He wants to reactivate a childlike imagination in adults so they begin to see trash as objects that can be repurposed in practical and even picturesque ways. And he loves to entertain kids, too.

Nowadays, Mr. Dambo gets a kick out of seeking waste everywhere, hoping to find more stuff he could refashion into something amazing.

9 . A big city might not seem like the best place to learn about nature and the environment. But one group in Washington, D. C. is trying to change that. City Blossoms is a non-profit organization, with the aim to bring nature to children who might not otherwise have green spaces. The organization has assisted in creating green spaces at seven elementary schools.

City Blossoms assists schools in creating and caring for the garden. But the gardens are mainly operated by the schools. McNerney partners with schools that already understand the importance of an outdoor education. “It’s a school-run program that City Blossoms is supporting,” McNerney said. “We don’t want it to be a ‘plop and drop’ where it’s seen as a City Blossoms garden and it’s not fully embraced by the community, because that won’t really lead to a sustainable garden program.”

“At the end of the day, we’re not designing these sites,” said Isa Zambrano, who oversees the community gardens for City Blossoms. She helps maintain the community spaces for City Blossoms. “The community designs it. Every garden takes the shape of the community and the culture that exists there. Young children and older adults have gotten involved with the community green spaces,” said Isa. During cooking lessons, for example, people will talk about meals that are special to their culture.

While City Blossoms’ main goal is to teach children, many older families and adults have also gotten involved. The organization holds gardening lessons for all ages. Isa said the pandemic had made people want to spend more time outside experiencing nature. “People have really woken up to the fact that green spaces are really important in our communities,” she added. “They have realized the good that comes from being outdoors and being disconnected from technology,” she explained.