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"Concerted efforts are needed because 25 percent of global land resources have degraded, leaving 1.5 billion people suffering from sandstorms. Therefore, more exchange programs on desertification will be carried out between China and other nations," Zhang said at an international conference marking the 25th anniversary of World Day to Combat Desertification and Drought.

"Companies are facing challenges because most of them lack the core competitiveness. It's a good thing for the market to decide who can survive and who should be kicked out," he said.

"Chinese colleagues are like our brothers, we take care of each other," said Hosam Alghamdi, a Saudi manager of the public relations department of YASREF. "The company is more like a cultural integration rather than just business cooperation."

"Chinese culture is multifaceted. We focus on each aspect every year. For example, in 2014, our theme was the city, and its people and culture. In 2015, we fixed our eyes on the Chinese devotion to their country and for a better life. In 2016, it was about ethnic charms. The green ecological culture in 2018 piqued our interest. In the first few years, the project could only attract a small number of foreign talents, and most of them were filming in big cities such as Beijing. By now, their works almost cover the country," Huang says.

"Competition in the retail market has been intensive and independent oil companies are also expanding their retail networks to compete with the State-owned ones," she said, adding that Sinopec's retail volume fell 3.47 percent year-on-year in the first quarter.