【推荐2】There is a wide range of “last chance tourism” destinations around the planet, many of which are threatened by the effect of global warming.

The world-famous Glacier National Park spreads over a million acres in Montana. The park welcomes about 3 million visitors each year to its unique ecosystem. However, its glaciers are quickly shrinking in size, and continue to affect the ecosystem with the non-stop melting. At today’s global warming rates, these glaciers will disappear in the next few decades.

Kilimanjaro, the “Root of Africa”, dominates the tropical landscape of Tanzania in Africa. It is a destination for the climbers wishing to conquer Kilimanjaro’s peak at 5895 meters above sea level. The mountain’s steep walls used to be fully covered in ice sheets while today they sit nearly bare, having lost 85% of the coverage due to the ever-rising temperatures. It is highly likely to lose all the snow in just 20 years.

Rio, surrounded by amazing coastlines, is a tourist hotspot in Brazil with colored cityscape and diverse culture. Many know Rio for the Carnival festival with dazzling events. Climate experts project a sea-level rise of 32 inches around Rio and floods that will cover the city’s famous beaches, and some inland neighborhoods by 2100.

The Dead Sea, the lowest point on the earth, is a renowned wellness destination for healing and relaxation. The sea is a fascinating 997-feet-deep natural wonder with no marine life. The high-salt content makes floating effortless and relaxing, as well as great for skin conditions. However, the increasingly hot and dry climate speeds up the rate of evaporation, making it a dry land by 2050.

【推荐3】Explore Scenic Train Journeys

The four most scenic train journeys provide not only beautiful sceneries at destination cities, but also charming views outside the trains’ windows on the way.

This train route is the longest high altitude train trip in the world—named as the way to the sky. Most of this route is over 4,000 meters and it goes above 5,000 meters several times. After the train has left Xining Railway Station for about an hour, you can see the boundless lake—Qinghai Lake.

This railway has an average high altitude of above 3,600 meters. It makes Tibet travel more convenient for travelers, especially those who want to see Mount Qomolangma. Along the railway line, you can see local farmers and yaks (牦牛). And most of the time, you can appreciate a plateau (高原) landscape of mountains and meadows.

From Chengdu’s plains area, with an altitude of about 400 meters, the train goes up to altitudes of about 2,000 meters, traveling through tunnels and across mountains. The complex geography along the railway line gives this route the name of Geological Museum.

Beijing and Shanghai are two of the most popular cities for foreign travelers who come to China for the first time. It is a trip that combines some of China’s main urban landscapes with cultivated countryside scenery and mountains in between. The new and modern facilities on the train ensure you have a comfortable journey.

【推荐1】Today, about 10% of the world's population are left-handed. Archeological evidence shows that it's been that way for as long as 500, 000 years, with about 10% of human remains showing the associated differences in arm length and bone density (密度), and some ancient tools and artifacts showing evidence of left-hand use.

A recent mathematical model suggests that the actual rate of handedness reflects a balance between competitive and cooperative pressures on human evolution.

The benefits of being left-handed are clearest in activities involving an opponent, like combat (格斗) or competitive sports. For example, about 50% of top hitters in baseball have been lefthanded. Why? Because lefties are a minority to begin with, both right-handed and left-handed competitors will spend most of their time encountering and practicing against righties. So when the two face each other, the left-hander will more probably win this right-handed opponent.

The imbalance in the population results in an advantage for left-handed fighters or athletes, but according to the principles of evolution, groups that have a relative advantage disappears. If people were only fighting and competing throughout human evolution, natural selection would lead to more lefties being the ones that survived until there were so many of them that they were no longer rare.

So in a purely competitive world, 50% of the population would be left-handed. But human evolution has been shaped by cooperation, as well as competition. In golf, where performance doesn't depend on the opponent, only 4% of top players are left-handed. And many of the important instruments (器械) that have shaped society were designed for the right-handed majority Because lefties are worse at using these tools, and suffer from higher accident rates, they would be less successful in a purely cooperative world, eventually disappearing from the population.

【推荐3】Brown noise is one classification of noise “color”. Each color represents long-lasting patterns of noise frequencies that we can hear, ranging from 20 to 20,000 hertz.

“White noise has equal energy at all frequencies. To us, it sounds like radio static,” explains Anahita Mehta, a researcher who studies sound pitch at the Kresge Hearing Research Institute at the University of Michigan. “Pink noise has more energy in low frequency ranges compared to the high ranges. It sounds lower than white noise. Examples would be rainfall or traffic.”

Then, there’s brown noise. It’s technically classified as red noise, but the nickname comes from the way it’s produced: Its sound signals change randomly to produce the sound of static, imitating a type of unsteady movement pattern, called Brownian motion. “Brown noise has even fewer high frequencies than white or pink noise, and you’ll recognize it as a lower sound,” Mehta says. “Examples would be the deep roar of an ocean wave crashing or thunder rolling.”

Although brown noise is the latest trend to make its way onto social media, scientists can only speculate about its benefits. Very little evidence exists on the effect of brown noise, and the proof that is available has included only small groups of participants for short periods of time. But there’s a growing interest to see if brown noise might help health.

Researchers suspect that brown noise may help produce the relaxation response in some people.“Maybe you find it relaxing to hear the sounds of the sea, so if you listen to brown noise that sounds like waves crashing, and it helps you, that’s great – as long as you’re listening at a low volume,” Mehta says. “However, there’s no strong evidence that listening to brown noise reduces stress.”

Despite the suspected promise of brown noise, researchers are also concerned about its potential harms.

【推荐3】Bamboo is the tallest member in the grass family. It is one of the fastest growing plants on earth, growing reportedly up to 98 inches in just 24 hours. Bamboo is mainly found in Asia, some parts of Africa and parts of the America in many different varieties. Over centuries bamboo has had a variety of uses like medicine, paper, construction, furniture, home decoration and musical instruments.

The use of bamboo as a construction material is not new and many countries have been using it to build homes for centuries. Bamboo’s unique and efficient natural design makes it a good building material.

Bamboo is very flexible and hence when it grows it can be defined to grow into specific shapes. Its shock absorption capacity (减震功能) makes it a great building material for earthquake- resistant houses. Bamboo houses can also stand a hurricane with wind speeds of up to 170 mph.

Bamboo is cheap and readily available in areas where it is cultivated. Transportation of bamboo is also cheaper than other materials.

The most important quality of bamboo is its environmentally friendly quality. It is renewable and bamboo forests can be grown in a few years. Its naturally smooth surface does not require painting, making it safe from health dangers caused by paint. Bamboo can be grown in a variety of climates and houses made of bamboo do not require use of other materials like concrete (混凝土), steel, etc. Pesticides (杀虫剂) and other chemicals need not be used while cultivating bamboo, making it more eco-friendly.

Bamboo also has certain drawbacks. For example, not all types of bamboo can be used for construction. Bamboo cannot be used to build the skyscrapers that we all love. Wet bamboo deteriorates (变坏) faster.

Despite all the drawbacks, the environmentally friendly features of bamboo make it a great building material. The few drawbacks that bamboo has can be mitigated with research and the use of bamboo as an alternative building material should be encouraged to make our earth greener.