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XINING, Oct. 3 (Xinhua) -- China will put environmental concerns as top priority in tackling ways to exploit combustible ice, a kind of natural gas hydrate, in the permanent tundra in its northwest plateau region, said a combustible ice project leader.     "We do not need to drill very deep to get the flammable frozen compound from tundra here in Muli Prefecture in Qinghai Province. However, as the sample is taken out, methane gas is easily released into the atmosphere," said Wen Huaijun, chief engineer of the combustible ice project in Qinghai.     He said the project team under the China National Administration of Coal Geology is carrying out research to guarantee that the exploitation of the frozen natural gas does not cause environmental problems.     Combustible ice is regarded as a potential source of alternative energy to coal and oil. One cubic meter of combustible ice can release 164 cubic meters of natural gas.     The Ministry of Land Resources said on Friday that the prospective volume of the natural gas hydrate in the country's frozen earth regions is estimated to reach 35 billion tonnes of oil equivalent.     China announced the first discovery of the resource under the bed of the South China Sea in May 2007.     Wen said the environmental threats from the use of the resource even in a land-based region is enormous, because it releases carbon dioxide or methane into the atmosphere.     "The plateau region is very sensitive to environmental changes. The biological conditions here are vulnerable," he said.     Combustible ice usually exists in seabed or tundra areas (two mediums having the strong pressure and low temperature necessary to its stability). It can be lit up like solid ethanol, which is why it has the name "combustible ice."     Wen said the combustible ice research project has been carried in Muli Prefecture, 4,100 meters above sea level, since 2004.     "It still takes time and a huge amount of research investment to realize the dream of exploiting the resource, while ensuring the environment," he said.     Wang Jianbin, deputy director of the Qinghai Bureau of Land Resources, said at the present stage, the project focus is still to ascertain locations of the deposit, and carry out a feasibility study on its exploitation.

PHOENIX, Sept. 6 (Xinhua) -- At the invitation of the speaker of the U.S. House of Representatives Nancy Pelosi, Chinese top legislator Wu Bangguo arrived here on Sunday to begin his official visit to the United States on the final leg of his three-nation America tour.     In a written statement released at the airport upon his arrival, Wu, chairman of the Standing Committee of China's National People's Congress, highlighted the "historical" growth of the China-U.S. relations in the past 30 years since the two nations forged diplomatic relations, noting that the bilateral ties already become the most important and the most dynamic ones in the world. Wu Bangguo (L), chairman of the Standing Committee of China's National People's Congress, the country's top legislature, shakes hands with Arizona Governor Jan Brewer greeting him upon his arrival at an airport in Phoenix of Arizona state Sept. 6, 2009. Wu Bangguo arrived here on Sunday for an official goodwill visit to the U.S., the final leg of his three-nation America tourWu will be visiting Washington Tuesday where he is expected to hold talks with Pelosi, meet with U.S. President Barack Obama, Vice President Joe Biden and Secretary of State Hillary Clinton.     "My visit to the United States is the first by a Chinese top legislator in the past 20 years," Wu said in the statement, noting that the purpose of his visit is to further implement the important consensus reached by the Chinese president Hu Jintao and Obama in an aim to push forward the positive, cooperative and comprehensive Sino-American relations.     Wu arrived here after he concluded his official visit to Cuba and the Bahamas.

URUMQI, Sept. 5 (Xinhua) -- The party chief of Urumqi and police chief of northwest China's Xinjiang Uygur Autonomous Region were removed from their posts Saturday. The removal came after the July 5 riot in Urumqi which left 197people dead and following syringe attacks in the city that caused panic among the public. Li Zhi, 59, secretary of the Urumqi Municipal Committee of the Communist Party of China (CPC), was replaced by Zhu Hailun, 51, secretary of the CPC Xinjiang Autonomous Regional Political and Legislative Affairs Committee, according to a decision by the CPC Xinjiang Autonomous Regional Committee and approved by the CPC Central Committee.     Li was appointed the Urumqi party chief in November, 2006.     Also on Saturday, Xinjiang's police chief Liu Yaohua was replaced by Zhu Changjie, party chief of Xinjiang's Aksu Prefecture. Deputy Mayor of Urumqi Zhang Hong speaks during a news conference in Urumqi, capital city of northwest China's Xinjiang Uygur Autonomous Region, Sept. 4, 2009. Zhang Hong said on Friday the situation was basically under control in the city.     SYRINGE ATTACKS     Fresh protests broke out this week after hundreds of Urumqi residents reported that they were stabbed by syringes. Five people were dead and at least 14 people hospitalized over injuries in the protests.     Tens of thousands of people took to the streets to protest against the syringe attacks and demand security guarantees.     By Thursday, local hospitals had dealt with 531 victims of hypodermic syringe stabbings, 106 of whom showed obvious signs of needle attacks.     Chinese military medical experts on Saturday ruled out the possibility that radioactive substance, anthrax and toxic chemical were used in recent syringe attacks in Urumqi City.     "According to the preliminary test results, such possibilities can be ruled out," said Qian Jun, director of Disease Control and Biological Security Office with China's Academy of Military Medical Sciences.     Qian said he, along with other five medical experts from the military, had examined medical records of more than 200 victims since Friday.     Samples had been sent to Beijing for further test, Qian added.     Xinjiang police has captured 25 suspects amid the syringe scare, of whom seven are in police custody, four were arrested and four others were referred for criminal prosecution.     Four suspects, three men and one woman, have been prosecuted for endangering public security, said Wutkur Abdurahman, procurator general of the city's procuratorate Saturday.     The four, all from the Uygur ethnic group, were involved in three cases.     Two suspects threatened a taxi driver with a syringe and robbed him, one suspect allegedly inserted a pin into a woman's buttock at a roadside fruit stall, and the other injured police when resisting arrest with a syringe that contained drug.     SOCIAL ORDER BACK TO NORMAL     Xinhua reporters witnessed Saturday that most of the buses in Urumqi had resumed operation. People could be seen on buses, some of which were even a bit crowded. Many were waiting at bus stops.     A large number of customers could be seen at the Carrefour Supermarket at Nanhunanlu Road. Long queues were seen in front of the cashiers at noon.     In Hepingnanlu Road and Xinhuananlu Road, areas mainly inhabited by people of Uygur ethnic group, shops on both sides of the roads have resumed operation.     Situation in Urumqi came under control Friday, as there were no major protests in the city. Small crowds, which gathered "in a fewlocations," were soon dispersed, said Executive Deputy Mayor ZhangHong. E(Xinhua correspondents Zhang Zongtang, Cao Kai, Liu Hongpeng, Huang Yan, Ding Jiangang contributed to the story.)

HONG KONG, Sept. 8 (Xinhua) -- The Commercial Aircraft Corporation of China displayed a scale model of its jetliner C919,the country's first home-grown large commercial airliner, for the first time at the Asian Aerospace '09 on Tuesday. With a scale of one to ten, the model was so far "the most precise one put up for public display," said Guo Bozhi, president of the Shanghai Aircraft Design and Research Institute, a unit of the Commercial Aircraft Corporation of China, or COMAC.     The mockup was displayed at a prominent position at the Asian Aerospace, Asia's leading air show, side by side with industry giants like Boeing and Airbus. Together with some ten other Chinese mainland-based manufacturers, suppliers and service providers at the show, it attracted attention of media from around the world. A mockup of jumbo jet C919, the major project of the Commercial Aircraft Corporation of China (COMAC), is displayed at the Asian Aerospace '09 in Hong Kong, China, Sept. 8, 2009. COMAC is a company established in 2008 with the State Council approval to develop C919, the first home-made jumbo jet of China. It is expected to enter service in 2016    "It's the first time that China has put a face in front of the global aviation industry," said Richard Thiele, global head of sales for Reed Exhibitions, organizer of the show.     COMAC has currently sent out requests for proposal, or RPFs, to over 100 potential suppliers, both domestic and international, and signed memorandums of understanding with nine domestic airframe suppliers. The company has been in touch with engine suppliers including General Electric, Rolls Royce and Pratt&Whitney, Guo said. A mockup of jumbo jet C919, the major project of the Commercial Aircraft Corporation of China (COMAC), is displayed at the Asian Aerospace '09 in Hong Kong, China, Sept. 8, 2009The Shanghai-based company has been using standard bidding process in line with international practices for the systems and equipment it needed for the C919 project, said Wang Wenbin, assistant general manager of COMAC.     COMAC was set up with state approval in 2008 to develop China's first home-grown jumbo jet. It has a registered capital of 19 billion yuan (2.78 billion U.S. dollars), with the State-owned Assets Supervision and Administration Commission as the biggest shareholder.     The company has said the maiden flight of C919 was planned for late 2014, with delivery expected by 2016. It was intended as a single-aisle airliner to target the short and medium haul markets in eight to ten years from now, Wang said.     If successful, COMAC plans to produce 50 C919 aircraft each year at the early stage and annual production could reach 100 or even more at a later stage, depending on how it is received by the market, Guo said. A mockup of jumbo jet C919, the major project of the Commercial Aircraft Corporation of China (COMAC), is displayed at the Asian Aerospace '09 in Hong Kong, China, Sept. 8, 2009. C919 has a standard range of 4,075 kilometers, and the extended range can reach a maximum of 5,555 kilometers. It has a designed capacity of 168 seats for the full economy class version and 156 seats for mixed class version.     Wang said China has been behind leading industry players in commercial airliner development and is aspiring to have its own home-made large commercial airliner.     COMAC plans to develop the C919 under the cooperation model involving suppliers and main manufacturers, and international partnership are welcome, he said.

NEW DELHI, Aug. 7 (Xinhua) -- Sonia Gandhi, chairperson of India's ruling Congress-led United Progress Alliance (UPA), Friday expressed her wish that relations between India and China can be enhanced with common efforts by the two countries.     During a meeting with visiting Chinese State Councilor Dai Bingguo, Gandhi said that there exists a very solid basis for developing friendly and cooperative relations between India and China. Dai conveyed cordial greeting and good wishes from General Secretary of the Central Committee of the Communist Party of China and Chinese President Hu Jintao, who also expressed his congratulations to the Congress party and the UPA for successfully winning a second term of government in the general elections this year. Indian Congress Party President Sonia Gandhi (R) shakes hands with Chinese State Councilor Dai Bingguo in New Delhi, capital of India, Aug. 7, 2009    Dai said that the Chinese government pays great importance to developing long-term, stable and healthy friendly cooperative relations with India. Under the current international and regional situation, China and India have huge potentials to develop their bilateral cooperation as two biggest developing countries in the world.     Dai also expressed his belief that the future of such cooperation is very bright.     Dai praised the UPA for helping push forward relations with China since it assumed power more than five years ago. He said that President Gandhi has personally made great efforts for the development of Sino-Indian relations as leader of the UPA and the Congress party.     Dai also said China is willing to make common efforts with India to upgrade the bilateral strategic cooperative partnership to a new level.     Gandhi also memorized the 1988 historic visit to China by her late husband, former Prime Minister Rajiv Gandhi, as well as her attendance of the opening ceremony of the 2008 Beijing Olympics.     She expressed her wish that as the 60th anniversary of establishment of diplomatic relations between India and China is nearing, the peoples of India and China, especially the youth of the two countries, increase human exchanges to build a good social foundation for furthering friendship between the two countries.     Dai and Gandhi also exchanged views on strengthening friendly ties between the Communist Party of China and the Congress party of India.