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Its Academic Ranking of World Universities is made up of six objective indicators, including the number of alumni and staff winning Nobel Prizes and Fields Medals, the number of highly-cited researchers, the number of articles published in the journals Nature and Science, the number of articles indexed in the "Science Citation Index", and their per capita performance.
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China is spending heavily on renewable and nuclear energy as it tries to slow the growth of coal, but despite those efforts it has become by far the largest emitter of greenhouse gases. Its emissions of 10 billion tons a year of carbon dioxide from the burning of fossil fuels and cement manufacturing are almost twice those of the United States, though emissions per person are still far higher in the United States.