将全球变暖限制在1.5°C而不是2°C对昆虫,脊椎动物和植物的预期影响
概括
与2°C相比,将全球变暖限制在1.5°C显著减少预计的物种范围损失. 这一关键的气候目标保护了生物多样性,减少了面临严重息地减少的昆虫,植物和脊椎动物.
科学领域:
- 气候变化生物学
- 生物多样性的保护
- 生态建模
背景情况:
- 巴黎协定旨在将全球变暖限制在1.5°C,这是比之前的2°C目标更宏伟的目标.
- 目前全球气候承诺不足,预计全球气候将升温约3.2°C.
- 预计在各种变暖情景下,生物多样性会大大减少.
研究的目的:
- 量化不同全球变暖水平 (1.5°C,2°C和3.2°C) 对昆虫,植物和脊椎动物气候决定的地理范围损失的影响.
- 评估实现1.5°C升温限制与2°C限制对物种范围的保护所带来的好处.
主要方法:
- 使用与"巴黎协定"目标相关的气候预测数据.
- 模拟主要类型 (昆虫,植物,脊椎动物) 的气候确定范围变化.
- 在1.5°C,2°C和当前承诺 (~3.2°C) 变暖场景中比较预测范围的损失.
主要成果:
- 在~3.2°C的升温下,超过49%的昆虫,44%的植物和26%的脊椎动物可能会失去50%的范围.
- 在2°C的升温下,这些数字降至18% (昆虫),16% (植物) 和8% (脊椎动物).
- 在1.5°C的升温下,范围的损失进一步减少到6% (昆虫),8% (植物) 和4% (脊椎动物).
结论:
- 将全球变暖限制在1.5°C大大降低了面临严重范围缩减的物种比例.
- 与2°C相比,达到1.5°C的目标将使昆虫的物种数量减少约66%,植物和脊椎动物的物种数量减少约50%.
- 为了实现1.5°C的目标,迫切的气候行动对于全球生物多样性保护至关重要.
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