Xi said it has been 21 years since the UN desertification convention took effect. Major efforts from the parties have produced significant changes since then, but many people still suffer from desertification.
Xi also underlined the importance of further enhancing law enforcement cooperation and people-to-people exchanges.
Wu will then move on to villages close to the city and to beaches. He plans to return to China sometime next year.
Xi told officers to look for, support and make full use of advanced technologies that can serve the military's modernization and to assist the transfer of defense technologies to the business sector.
Xi has hailed "the historic changes" in development over the past five "extraordinary" years, saying China's development is standing at a new historical starting point, and socialism with Chinese characteristics has entered a new development stage.
Xi also visited a museum to learn about the city's history of opening-up as a port, its achievements as a special economic zone and its future development plans.
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Xi called for efforts to further study and interpret the works of Marxism, popularize them and have them embraced by hundreds of millions of people.
Wu took bribes with a total worth of 21.71 million yuan directly or through his relatives, the court heard. All of his illegal gains have been confiscated by the country.
Xi has proposed forging a community of shared destiny for mankind, as well as establishing a new type of international relations with win-win cooperation at the core.
Wu said that China is on course to optimize its industrial structure and offer more favorable policies to global companies. Against this backdrop, DHL Express, supported by 7,300 employees in China, will further expand its Guangzhou gateway, Wu said.