2 . If you’d like to go sight-seeing, the following World Heritage Sites may be your best choices.

Jiuzhaigou Valley Scenic and Historic Interest Area

The Jiuzhaigou Valley, which lies in the northern part of Sichuan Province reaches a height of more than 4800 meters, with a series of different forest ecosystem(生态系统). There you can enjoy watching excellent waterfalls. Some 140 kinds of birds also live in the valley, as well as a number of endangered plants and animals, including the giant panda. For more information, please visit https://whc. unesco. org/en/list/637.

Khami Ruins National Monument

The city of Khami, which developed after the capital of Great Zimbabwe had been given up in the mid-16th century, is of great archaeological(考古的)interest. The discovery of objects from Europe and China shows that Khami was a major center for trade over a long period of time. For more information, please visit https://whc. unesco. org/en/list/365

Henderson Island

Henderson Island which lies in the eastern South Pacific, is one of the few atolls(环礁)in the world whose ecology(生态)has not been touched by human beings. It is especially famous for the ten plants and four land birds that can only be seen on the island. For more information, please visit https://whc. unesco. org/e n/list/487.

The Old City of Jerusalem

As a holy city for three different religions in the Middle East, Jerusalem has always been of great religious importance. It was given a World Heritage Status in 1981 and placed on the “List of World Heritage in Danger” the following year. For more information, please visit https://whc. unesco. org/en/list/148.

4 . From the moment you open your eyes in the morning,     you can feel sweat (汗水)running down your body,     even if you’re barely moving at all. That’s what most people in China felt like this summer. In fact, the entire northern hemisphere(半球 )saw high temperatures in July. The Arctic Circle(北极圈) was no exception(例外). Temperatures in the city of Norilsk, which is in the Arctic Circle, reached a record high of 32 ℃,   The Atlantic reported. Temperatures there are usually just 10 ℃ at this time of the year.

The heat wave in the Arctic is mainly a long-term result of global warming, according to the Chinese Academy of Meteorological Sciences. In fact, while the whole world is getting warmer, the Arctic is warming twice as fast as the rest of the planet. This is called the polar amplification effect(极地放大效应).

The most direct impact(影响) of Arctic warming is the melting of Arctic ice. According to NASA,     Arctic sea ice is now disappearing at a rate of 13. 2 percent every 10 years. NASA said that if this continues,     the Arctic will have no ice by the year 2040.   This has put some Arctic animals, like polar bears, in danger. The ice that the bears live on has shrunk(缩小), the Toronto Star reported.

Melting ice can also cause sea levels to rise in the long term. Since 1993, sea levels have risen at a rate of 3. 2 cm every 10 years, the Guardian reported. Some countries, such as Tuvalu(图瓦卢) in the South Pacific Ocean and Maldives(马尔代夫) in the Indian Ocean, are at risk of disappearing into the sea.