1 . Health officials in Canada are very busy these days. They are placing chickens at fixed points all along their border with the United States of America. That’s an enormous distance of 2,500 km.

It’s not a practical joke, nor have the Canadians gone mad. They are using these chickens to see if the deadly West Nile virus is lurking around. The virus infects birds, so they think that the chickens have a good chance of catching the virus. Or the virus will catch the chickens.

Countries around the world are realizing something important. That it may just be possible to stop certain kinds of people from entering their land, but it is very difficult to try and stop viruses that travel from one end of the earth to another. When they travel to new places, they adjust very easily to those climates and sometimes start destroying the local plant and animal life. These biological polluters are called smart polluters.

These smart polluters can be carried across borders of countries unknowingly. Just as we humans are travelling across the globe more often than earlier, these biological polluters have also started journeying much more. They slide into aircraft through their wheels. They bore their way into objects that air travelers may be carrying from one country to another.

Suddenly, a lot of things become clearer. Like why the customs officials in many foreign countries prevent you from bringing in a small plant, or a decorative item made of wood that is in its natural form… They tell you that it’s in the rules.

They have these rules because they know that these varieties of plants that are special to specific places have the power to spread new diseases among native plants and animals. They are called biological polluters and they always create problems in places where they do not belong. They could be special varieties of plants, bugs or even animals.

4 . Every day as the sun rises, Ma Hongyi, a 66-year-old farmer, can be seen patrolling (巡逻) Yuncheng Salt Lake with his dog in Yuncheng city, North China’s Shanxi province.

Ma still remembers the day when he first saw two big pink birds wandering through the water. “I had never seen such pretty birds. They were even taller than me, with long wings,” Ma recalls. He was later informed that those birds were flamingos, a rare sight in China, which were listed on the International Union for Protection of Nature’s red list of endangered species in 2013. From that day on, Ma started his second career as a volunteer to prevent human beings from doing harm to the wildlife. “The birds are attracted by the good environment,” Ma says. “I will do my best to protect the lake so that birds can come here every year.”

Yuncheng Salt Lake covers an area of 132 square kilometers and used to serve as a salt production base. As the country began attaching greater importance to environmental protection, an ecological (生态的) protection and development center was set up in 2012 to carry out regular ecological protection and restoration of the lake. “The greatest value of the Salt Lake lies in its ecology, which should be properly protected,” says Chu Xianghao, head of the city. The lake area hosts 292 types of wild animals, along with 782 plant varieties, some of which are newly recorded species in the country.

After patrolling the lake as a volunteer for over four years, Ma was employed by the local government to help with wildlife protection in 2019. “The lake’s ecology is getting better,” Ma says, adding that he looks forward to the arrival of the flamingos every year. “Some of them are my old friends,” he says.

8 . Climate change and land-use change are projected to make wildfires more frequent and intense, with a global increase of extreme fires of up to 14 per cent by 2030, 30 per cent by the end of 2050 and 50 per cent by the end of the century, according to a new report by the UN Environment Programme (UNEP) and GRID-Arendal.

The paper calls for a complete change in government spending on wildfires, changing their investments from reaction and response to prevention and preparedness.

The report, Spreading like Wildfire: The Rising Threat of Extraordinary Landscape Fires, finds a higher risk even for the Arctic and other regions previously unaffected by wildfires. The report had been released before representatives of 193 nations held a meeting in Nairobi for the restarted 5th session of the UN Environment Assembly (UNEA-5.2), between 28 February and 2 March, 2022.

The publication calls on governments to adopt a new “Fire Ready Formula” with two-thirds of spending devoted to planning, prevention, preparedness, and recovery, with one third left for response. Currently, direct responses to wildfires typically receive over hall of related cost, while planning and prevention receive less than one per cent.

To prevent fires, authors call for a combination of data and science-based monitoring systems with native knowledge and for a stronger regional and international cooperation.

“Current government responses to wildfires are often putting money in the wrong place. Those emergency service workers and firefighters on the frontlines who are risking their lives to fight forest wildfires need to be supported. We have to reduce the risk of extreme wildfires by being better prepared: invest more in fire risk reduction, work with local communities, and strengthen global commitment to fight climate change.” said Inger Andersen, UNEP Executive Director.

Wildfires disproportionately (不成比例地) affect the world’s poorest nations. With an impact that extends for days, weeks and even years after the flames die down, they block progress towards the UN Sustainable Development Coals and deepen social inequalities.

9 . “How many of us as children have stared up at a church-like top of a giant tree and climbed it in wonder, which is a rally special part of our lives?” asks Bill Laurance, a tropical ecologist at James Cook University. “The leaves of big trees in forests are spreading out in all directions. We’re faced with organisms that have evolved for long periods of ecological stability.”

“There’s a lot to discuss on the issue,” says David Lindenmayer, a conservation ecologist at the Australian National University. “Climate change will mean that, in some forests, big trees won’t reach the same sizes they used to.” The effects of climate change, including long droughts, more invasive species and so on increase the simple physical challenges that big trees face in pulling water from their roots to their leaves and withstanding windstorms.

Lindenmayer and Laurance define “large, old trees” as the largest five percent mature trees within a species. The flexible definition means that in some forests, the large, old trees might be only 20 meters tall and 100 years old.

These large, old trees control the surrounding plant communities, affect water and nutrient distribution, and provide food and shelter for wildlife. “They’re really the breadbaskets of the forest,” says Laurance. “This is a very environmentally and ecologically important group of organisms, and they need special care and handling.” Determining the distribution and habitat requirements for large, old trees in the landscape is the first step towards ensuring their survival, “We have to ensure that what we’re thinking is long-term, to match the way these trees have existed for hundreds or even thousands of years,” says Laurance. “It’s going to be a real challenge to keep some places where there is still wildlife and the big church-like trees that we all really care about.”

Last Thursday, we had a class meeting to discuss what we were going to do on the weekend. We came up with several ideas such going to a park, climbing a mountain, and go boating. Final, we decided to climb a mountain where is close to our school.

The next day, we left early in the morning. Along the way, we enjoyed the warm sunshines and beautiful nature. However, when we reached the mountain top, we were shocking to see rubbish here or there. Then we asked the other tourists to join in us to pick up the rubbish.

We collect and put the rubbish in our paper bags. They were tired but felt very happy.