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China began importing solid waste as a source of raw materials in the 1980s, and has for years been the world's largest importer of recyclable materials. Solid waste often contains hazardous elements.
China has placed great emphasis on building an ecological civilization and made great headway in the prevention and control of desertification, Xi said in the letter.
China has become one of Siemens' largest research and development locations worldwide. The company now enjoys cooperation with a number of local governments and 87 universities and technology institutes in China, with an aim to conduct scientific research and develop talent.
China has been steadily moving toward an innovation-focused economy. In many areas such as clean air, mass transport, new energy sources and the digital economy, China is already a pioneer.
China believes "this region has a very good medium for a long-term outlook, and as part of the region, Chile celebrates that development," he said.