1 . While pedaling hard on a bike, do you feel like you are saving the planet? Or do you just feel out of breath? In fact, cycling is now considered one of the ultimate weapons humanity can use in the fight against climate change.

The United Nations General Assembly passed a resolution in March supporting bicycles as a tool for dealing with climate change. The resolution calls on member states to “integrate the bicycle into public transportation, in urban and rural settings in developing and developed countries”, with all 193 members of the UN unanimously (一致同意地) adopting the resolution.

This decision has received a positive response from numerous groups in support of cycling and environmental awareness internationally. “It is an important step toward the recognition of cycling as an important mode of transport,” said the European Cyclists’ Federation.

The resolution from the UN comes at a time when climate change has returned to the center of global attention. On Feb 28, the UN published a new report assessing recent climate change trends. The report warns that the global average temperature will rise by 1.5 C above pre-industrial levels (1850-1900), with more than 40 percent of the world’s population being “highly vulnerable” to these temperature changes.

In May 2020, bike sales in Spain increased 22-fold (22倍) compared with 2019. In London, large parts of the city are being closed off to cars so that people can walk and cycle safely. Cities like Berlin and Montreal have also added new, wider bike lanes.

More importantly, the resolution focuses on bike-sharing services, which could be seen as recognition of China’s bike-sharing success, noted CGTN.

China has some of the largest bike-sharing systems in the world. The country has more than 360 cities with dockless (无桩的) bike-sharing systems, with nearly 20 million bicycles for an average 47 million trips each day, according to China’s Ministry of Transport. This transportation option that produces zero emissions reduces the amount of CO2 released into the atmosphere by 4.8 million tons every year, according to a 2020 report from the World Resources Institute.

4 . Zhang Fan, 36, a movie visual effects designer who returned to Beijing from New Zealand for work last year, was surprised by the improvement to the city’s air quality. “I remember the smell in the air and the frequent smoggy days before I left in 2013, after getting a job offer from a film company in New Zealand, ” he said. Last year, a Chinese company offered Zhang a more promising position, so he returned, saying that he could find more opportunities in his line of work in Beijing than elsewhere. In addition to rapid economic development in the Chinese capital, he said the most impressive change is the local air quality. “People discussed air pollution a lot when I was in Beijing previously. Now, it seems that the topic has disappeared completely, as every day is good in terms of air quality,” Zhang said. “The sky in Beijing these days is so clear. ”

On Jan. 4, the municipal authorities in Beijing announced a comprehensive success in improving air quality, with the city’s annual average concentration of PM2. 5 in the air, falling to 33 micrograms per cubic meter, and ozone (臭氧) concentration dropping to 149 mcg per cu m last year.

Yu Jianhua, spokesman for the Beijing Municipal Ecology and Environment Bureau, said at a news conference, “This is a milestone for Beijing’s hard work in fighting air pollution and also means that the city has met its air quality target outlined in the 14th Five-Year Plan(2021-25) ahead of schedule. Beijing has demonstrated to the world over the past 20 years that a mega city with a rapidly increasing GDP, vehicle count, population and energy consumption can move forward to cut air pollution effectively. The PM2.5 reduction over the past few years has surpassed that of developed countries during the same period.

According to the Bureau, the city’s average concentration of PM2.5 dropped by 63 percent last year from 2013, an average annual reduction of about 8 percent. The city experienced 288 days of good air quality last year—up from 112 days in 2013—and just eight days of heavy air pollution. This achievement is clear to see and exciting, but it has not been easy work.

6 . The Greenwood fire took its name from the nearby lake where lightning struck on Aug.15, causing a wildfire that burned for weeks. Fueled by drought and wind, its persistence dominated headlines for much of late summer and early fall in Minnesota. When the last flames were finally put out, the northern Minnesota fire had consumed nearly 27,000 acres, countless firefighting resources, and at its worst, the lives that some had built around nearby McDougal Lake. Vast areas of forest were left burned-out, with the black and bare remains of what were once massive pines.

But, despite the destruction left behind, Mother Nature is set to a comeback. When organic matter is burned from the forest floor, seeds dropped by plants and trees begin to take hold, with the sprouting species emerging first. The trees above have died, which sends a chemical signal to the root system that is actually more expansive than just under that tree, and that chemical response encourages those root systems to re-grow. Ten years ago, a fire ripped through 93,000 acres of Minnesota forest in and around the BWCA. Today, that burnt area's rebirth is well underway.

"Here in the Pagami Creek wildfire scar, we have Jack Pine, Red Pine, Black Spruce, Aspen and paper birch-those are our main species, those are the ones that are growing quickly. It's 10 years on, and these trees are 10 to 15 feet tall in many areas," said Kyle Stover from the U.S. Forest Service.

A wildfire kills most things in its path, but despite the flames and intense temperatures, rarely is everything reduced to ashes -and that plays a key role in a forest's regeneration. Just one year after the fire, the survivors dominate the forest, and grasses replace the burnt ground. Wildflowers are abundant bushes and small trees have started to grow, and Jack Pine returned. So, it's an amazing ecological system of creating new forest life when it appears that all is lost, one that has evolved throughout the ages, where fire has always played a vital role.

7 . Angela Pozzi didn’t like seeing plastic trash washing up on the shore near her home in Bandon, Oregon. She wanted to unite her community to clean it up, so she started an organization and called it Washed Ashore: Art to Save the Sea.

Volunteers help clean up Oregon’s 300 miles of shoreline. Then, using only plastics from the beach cleanup, Ms Pozzi and her staff and many, many volunteers create sculptures of sea animals. Ms Pozzi says, “I want to create sculptures that, hopefully, will make people consider their plastic purchases and be aware of how so much plastic ends up in the oceans.”

Since 2010, more than 10,000 volunteers have collected 21 tons of trash and helped create more than 70 works of art. Four traveling exhibits have displayed the sculptures in more than 18 places. Shedd Aquarium in Chicago, Illinois, hosted an exhibit through September 2018.

People have used plastics to create life-saving medical devices, inexpensive containers and gadgets, and toys, of course. But unlike wood, cotton, and other natural materials, plastics don’t break down into anything useful to other living things. Instead, they stay for years in landfills, waterways, and the oceans. The materials are harmful to some sea animals, such as turtles, sea lions, and birds. Some of these creatures eat plastic objects that look like food. Others become entangled (被缠住) in plastic nets or packaging.

Ms Pozzi gives credit to everyone who helps. “One person didn’t create these sculptures,” she says. “Some people have picked up the plastic; others have sorted the items by color. Still others have washed each piece of plastic trash. Volunteers have drilled holes or helped to make the small wire-stitched panels, while others welded (焊接) the giant frames. I do the heads and detail work, and my staff and I take all the pieces everyone contributes to finish the work.” Says Ms Pozzi, “Until we run out of plastic on the beach, the work will continue.”

Tourists have been warned not to take sand and seashells from beaches in Sardinia, an Italian island in the Mediterranean Sea. More than 40 people,     1     took a combined 100 kilograms of sand and shells, have been fined up to £2,575 each. The law     2     (introduce) in 2017 to ban people from taking the items as souvenirs of their trips. Experts express     3     (they) worry that it could cause beaches to become smaller.

9 . On a sunny afternoon, Andreas Fath climbed out of a river in Paducah. A small crowd was on hand to witness his setting a new world record. This man had just finished swimming the entire length of the Tennessee River—1,049 kilometers. And he did it in just 34 days!

As a chemist from Hochshule Furtwangen University, the 52-year-old man had taken on this swim for science. His primary goal was not to get his name into Guinness World Records. What really drove this swim was a desire to make people aware of the seriousness of water pollution.

Fath’s crew included his family. Martin Knoll, who helped organize Fath’s swim, also took par t. Knoll is an environmental scientist at the University of the South. He describes this swim as a vehicle for getting people interested in water quality and how we pollute water without realizing it.

It took Fath 34 days to swim the river’s length. Along the way, his crew took measurements of the water’s temperature and pH. They also recorded weather and the speed of the river’s currents (涌流). As for the Tennessee River, they collected daily water samples. A small plastic device attached to one leg of Fath’s wet suit sampled the chemical pollutants (污染物) through which he swam. Finally, Fath’s goal is to use such data to know what on earth results in water pollution. Then he wants to find ways to keep those chemicals out of the water.

Back in Germany, Fath and his students have finished examining their data. They plan to publish their findings soon. Identifying materials that hide in the river isn’t only important for the animals that live there. “It’s also a way to protect human health,” says Fath.

10 . Nearly 40 years ago, Peter Harrison, a marine ecologist witnessed the first recorded large-scale coral bleaching（珊瑚白化）event. Diving in the Great Barrier Reef（大堡礁）, he was shocked by the scene before him. "The reef was made up of healthy corals and badly bleached white corals, like the beginnings of a ghost city," he says. Just months before, the same site was filled with colorful tropical life.

"Many of the hundreds of corals that I'd carefully tagged and monitored finally died," he says. "It was shocking and made me aware of just how weak these corals really are.”

Coral exists together with photosynthetic algae（藻类）, which live in its tissues and provide essential nutrition（and coloration）. But high temperatures and other stresses can turn algae poisonous. When this occurs, the algae may die or be removed by the coral, a process known as bleaching because the coral's clear tissue and white calcium carbonate skeleton（碳酸钙骨骼）are exposed. If the coral can't reestablish its link with algae, it will starve or become ill.

The widespread destruction Harrison saw in 1982 was repeated on many other Pacific Ocean reefs that year and the next. In 1997 and 1998 the phenomenon went global, killing some 16 percent of the world's corals. With rising temperatures, pollution, disease, increased ocean acidity, invasive species, and other dangers, Harrison's ghost cities are expanding

Scientists suppose that about four decades ago severe bleaching occurred roughly every 25 years, giving corals time to recover. But bleaching events are coming faster now—about every six years—and in some places soon they could begin to happen annually.

"The absolute key is dealing with global warming," says marine biologist Terry Hughes. "No matter how much we clean up the water, the reefs will die." In 2016, a record-hot year in a string of them, 91 percent of the reefs that consist of the Great Barrier Reef bleached.