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Built to prevent incursions from barbarian nomads into the Chinese Empire.
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Rice cultivation was spread and common in Western Africa by the end of the 17th century.
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In China, surface mining of coal started.
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Surface coal mining production was 4% of the ountry’s production rate.
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The total production of coal was only 32.43Mt.
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Production with coal decreased due to other technologies that are easier to use/ acquire and less efffective negatively to the enviornment.
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When China began to get heavily polluted, the Great Wall of China was also polluted. This big structure began to get covered by smog and polluted items such as plastic water bottles.
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The Three Gorges Dam, located along the Yangtze River, became the largest functional damn in 2009.
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The rate reached 3.24 billion tons, the surface mined production was about 9 percent.
