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解析:
Recently, China's economy grows very fast．However, its pollution and emission problems are also surprising．China is already the biggest emitter of carbon dioxide despite the fact that its economy is only about a haft of the size of that of the U．S．The chief source of pollution is coal．China consumes about two-fifths of the world's coal at a growth rate of about 10 percent a year．The good news is that China's government is beginning to start a low carbon action which will power its future growth,development and energy security objectives．The government has also set an ambitious goal for using renewable energy, hoping that by 2020 about 20 percent of electricity needs will be met by wind and solar.