overshoot：全球正在逼近气候不可逆转的临界点
全球气温已在连续三年内突破1.5°C临界值，科学家警告地球正在逼近多个不可逆转的临界点——亚马逊雨林可能死亡、格陵兰冰盖每小时流失3000万吨冰、大西洋环流面临崩溃风险。 碳汇能力正在减弱， ocean和森林吸收CO2的效率在下降。要回到1.5°C需要移除数千亿吨碳，但现有的碳捕获技术既昂贵又规模不足，地球工程（如平流层喷洒气溶胶）能降温却解决不了天气系统已被破坏的事实。 政策层面几乎没有任何实质行动，美国已退出气候协议。
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