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Halving nitrogen pollution with urbanization in China
编号：51
访问权限：私有
更新：2023-04-25 16:24:03
浏览：570次
口头报告
报告开始：2023年05月08日 08:10（Asia/Shanghai）
报告时间：10min
所在会场：[8A] 8A、城市与区域地理 [8A-3] 8A -3 城市与区域地理
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摘要
Halving nitrogen pollution is crucial for achieving global sustainable development goals (SDGs), with a substantial share of this pollution being directly linked to nitrogen use and losses1. However, how to reduce such a large share of nitrogen pollution from multiple sources synergistically remains a grand challenge2,3. China is currently the world’s largest user of nitrogen and experiencing the largest losses to the environment4. At the same time, it is undergoing the most rapid urbanization, with a population of about 14 million migrating from rural to urban settings each year5. Here we show that reactive nitrogen (Nr) pollution could be roughly halved as a consequence of urbanization in China by 2050, with emissions of NH3, NOx and N2O to air declining by 54%, 35% and 32%, respectively, and nitrogen runoff and leaching to water bodies by 46%. Urbanization moves population from rural to urban areas, which reduces non-point source pollution from rural sewage and agriculture through large-scale and crop-livestock coupled farming. Although rural-to-urban migration increases point-source nitrogen emissions in metropolitan areas, regional air and water quality are improved due to urbanization reduces the upstream and regional total nitrogen losses to the environment, and control of point source emissions vs. diffuse emissions is more efficient. Approximate US$ 53 billion would be required for additional urban waste treatment, agricultural land consolidation and livestock relocation, as well as upgrading industrial facilities. However, the overall benefits are calculated at US$ 250 billion due to increased in agricultural productivity and improvements in environmental quality. Such a large benefit-to-cost ratio suggests the feasibility and cost-effectiveness of halving Nr pollution through urbanization, and this would make significant contributions to achieving several SDG targets.
关键词
SDG,Urbanization,Nitrogen
报告人
邓欧平
浙江大学稿件作者
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重要日期
-
会议日期
05月05日
2023
至05月08日
2023
-
03月31日 2023
初稿截稿日期
-
05月25日 2023
注册截止日期
主办单位
青年地学论坛理事会
中国科学院青年创新促进会地学分会
中国科学院青年创新促进会地学分会
承办单位
武汉大学
中国科学院精密测量科学与技术创新研究院
中国地质大学（武汉）
中国科学院精密测量科学与技术创新研究院
中国地质大学（武汉）
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