4 . Most environmental pollution on Earth comes from humans and their inventions, such as cars or plastic. Today, car emissions(排放物) area major source of air pollution leading to climate change, and plastics fill our ocean, creating a significant health issue to marine(海洋的) animals.

And what about the electric light, thought to be one of the greatest human inventions of all time? Electric light can be a beautiful thing, guiding us home when the sun goes down，keeping us safe and making our homes bright. However, like carbon dioxide emissions and plastic, too much of a good thing has started to impact the environment. Light pollution, the inappropriate use of outdoor light, is affecting human health, wildlife behavior and our ability to observe stars.

Light pollution is a global issue. This became obvious when the World Atlas of Artificial Night Sky Brightness, a computer-generated map based on thousands of satellite photos, was published in 2016. Available online for viewing, the map shows how and where our globe is lit up at night. Vast areas of North America, Europe, the Middle East and Asia are glowing(发光) with light, while only the most remote regions on Earth(Greenland, Central African Republic and Niue) are in total darkness. Some of the most light-polluted countries in the world are Singapore, Qatar, and Kuwait.

Sky glow is the brightening of the night sky, mostly over cities, due to the electric lights of cars, street lamps, offices, factories, outdoor advertising, and buildings, turning night into day for people who work and play long after sunset.

People living in cities with high levels of sky glow have a hard time seeing more than a handful of stars at night. Astronomers are particularly concerned with sky glow pollution as it reduces their ability to view stars.

More than 80 percent of the world’s population, and 99 percent of Americans and Europeans, live under sky glow.

6 . Mia, 18, had just started working as a lifesaver at a beach in Australia on New Year’s Eve when beach-goers started to point and shout at the water. The workers quickly examined the situation and saw that a kangaroo had jumped out of the bushes — straight into the sea.

The animal seemed confused by the fishermen standing on the rocks. So instead of turning back and heading back into the bushes, it jumped right into the water! The poor thing bobbed (摆动) around in the waves and went underwater several times before Mia decided to take action.

As with any other animal rescue, it’s important to approach the situation with care. Wild animals that are stressed can become dangerous to their rescuers, and Mia was aware of the risks as she took her rescue board and hit the water at a run. “It just didn’t want to come on to the beach because it was kind of scared,” she said, “I was trying to figure out how to get it on the board. But considering that it’s a wild animal, even though I was helping, I wouldn’t want to be hurt by it or make it more stressed out.”

As beach-goers recorded the rescue on their phones, Mia paddled (用桨划船) behind the animal carefully and guided the kangaroo onto the beach. As soon as Mia’s feet touched the sand, the beach erupted in cheers for her! “It was quite special. As people there were cheering and clapping, the kangaroo was just sitting there up in the bushes staring at me, as if it was conveying something with its shining eyes,” Mia said, “I didn’t think that was going to ever be my first rescue, I may have more rescues in the future, but none would be as memorable as this one.”

7 . The ocean is a huge body of saltwater that covers about 71 percent of Earth’s surface. An estimated 97 percent of the world’s water is found in the ocean. Because of this, the ocean has considerable impact on weather, temperature, and the food supply of humans and other organisms. The ocean remains a mystery. More than 80 percent of the ocean has never been mapped, explored, or even seen by humans. A far greater percentage of the surfaces of the moon and the planet Mars has been mapped and studied than of our own ocean floor.

Although there is much more to learn, oceanographers have already made some amazing discoveries. For example, we know that the ocean contains towering mountain ranges and deep valleys, just like those on land. The peak of the world’s tallest mountain—Mount Qomolangma in the Himalaya, measuring 8848. 86 meters high-would not even break the surface of the water if it was placed in the Pacific Ocean’s Mariana Trench or Philippine Trench, two of the deepest parts of the ocean. On the other hand, the Atlantic Ocean is relatively shallow because large parts of its seafloor are made up of continental shelves—parts of the continents that extend far out into the ocean. The average depth of the entire ocean is 3.720 meters.

It is unknown how many different species call the ocean their home. With many ocean ecosystems suffering from rising sea temperatures, pollution, and other problems, some oceanographers believe the number of species is dropping. Still, there may be many positive surprises awaiting oceanographers in the years ahead. It could be that more than 90 percent of the ocean’s species are still undiscovered, with some scientists estimating that there are anywhere between a few hundred thousand and a few million more to be discovered. Currently, scientists know of around 226,000 ocean species. Since the ocean is so vast, there is plenty for future oceanographers from all corners of the globe to explore and discover.

8 . Best Parks to See Wildlife

A recent report from a vacation site listed the total number of species and sizes of several well-known national parks. Here are some of them to see the widest variety of animals.

Cuyahoga Valley National Park, Ohio

Number of species per square meter: 317

Located 20 miles southwest of Cleveland, Ohio, Cuyahoga Valley National Park is a mixed ecosystem of forest and wetlands sheltering a variety of animals. From the boardwalk at Beaver Marsh, watch for water-loving mammals or snapping turtles (鳄龟) that can weigh as much as 55 pounds each. More than 200 bird species live in the park.

Carlsbad Caverns National Park, New Mexico

Number of species per square meter: 286

The representative for Carlsbad Caverns is the Brazilian free-tailed bat. Every summer, hundreds of thousands of the furry, big-eared creatures live in these caves in southeastern New Mexico, attracting crowds at sunset with their spectacular out Nlight. The Brazilians are one of he 17 bat species that nest at Carlsbad. You might also encounter wild pigs and cave swallows.

Acadia National Park, Maine

Number of species per square meter: 242

The Atlantic Ocean meets the Maine coast at this popular park on Mount Desert Island, providing habitat for wildlife with feet and flippers (鳍状肢) . From the shore, scan the water for the heads of harbor porpoises (鼠海豚) and gray seals.

Black Canyon of the Gunnison National Park, Colorado

Number of species per square meter: 219

In western Colorado, the 2, 722 feet between this park s canyon edge and the Gunnison River below support numerous wildlife habitats. Experienced climbers and hikers who adventure into the inner canyon find collared lizards and mule deer.

About 800 meters above sea level and next to the picturesque Taiping Lake, Houkeng village in Huangshan, a region in the south of Anhui Province, seems     1     (bless) by nature and is home to the handmade tea variety Taiping Kowkui. Every spring     2     foggy days moisten the emerald hillsides, villagers know their harvest will come. “    3     any of the three key factors — proper location, plant variety, or processing technique — the perfect Kowkui will not be born,” Fang Jifan, the fifth-generation tea farmer says. “It’s     4    signature of our home”.

Kowkui’s exceptionally large     5     (leaf) often lead to its being     6    (mistake) for   “vegetable”   by first-time viewers, but this “king” of green tea in Fang’s eyes beats other varieties at more than just size. “Its fragrance and flavor also stand out, thanks to the time-consuming work to process them.”   Fang says.

Last November, traditional tea processing techniques and associated social practices in   China     7     (add) to the UNESCO Representative List of the Intangible Cultural Heritage of Humanity. “The tea culture not only reflects a refined taste in life, it also shows the beauty of craftsmanship     8     people’s creativity.” says Zheng Yi, deputy head of Anhui Tea Culture Research Society. “For centuries, the scent of tea     9     (offer) nutrition to this land. This intangible cultural heritage of tea processing techniques is deeply rooted in people’s everyday life. This     10     (whole) handmade version of this famous tea showcases its soft and clean-flavored heirloom cultivar with a sea mineral aftertaste and signature fresh bamboo aroma. ”