地球：环境可持续性

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<blockquote class="wp-embedded-content"><a href="http://gem-report-2016.unesco.org/zh/chapter/%e5%9c%b0%e7%90%83%ef%bc%9a%e7%8e%af%e5%a2%83%e5%8f%af%e6%8c%81%e7%bb%ad%e6%80%a7/">地球：环境可持续性</a></blockquote>
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