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过度信任气候过度影响

Carl-Friedrich Schleussner1,2,3, Gaurav Ganti4,5,6, Quentin Lejeune5,6

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全球减少排放的努力不足. 过度排放途径暂时超过温暖化限制,但迅速减少排放对于限制长期气候风险和确保温度下降至关重要.

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科学领域:

  • 气候科学
  • 地球系统科学
  • 环境政策

背景情况:

  • 全球减少排放的努力未能达到"巴黎协定"的温度目标.
  • 越来越多的研究重点是暂时超过变暖极限的超越路径.
  • 了解与超标和随后的温度下降相关的风险至关重要.

研究的目的:

  • 分析气候变化和超标和非超标路径之间的差异.
  • 在超过温度目标后评估全球变暖的潜力.
  • 确定与气候超标相关的风险减轻的要求.

主要方法:

  • 在不同的排放场景下对气候变化预测进行比较分析.
  • 对影响温度轨迹的地球系统反的评估.
  • 评估二氧化碳去除的要求和可行性.

主要成果:

  • 超越路径导致气候变化影响与稳定路径不同.
  • 全球气温下降可以缓解海平面上升等长期风险.
  • 地球系统的反可能会阻碍温度逆转,而二氧化碳在规模上的去除也面临限制.

结论:

  • 虽然温度下降后可能会限制一些长期风险,但它的可行性是不确定的.
  • 短期快速减排是减轻气候风险的最有效策略.
  • 适应计划必须考虑依赖未来温度逆转的局限性.