研究人员称，海洋酸化已接近突破，而区域内气溶胶负荷已超过界限。平流层臭氧水平略有恢复。先前被确定为越界的界限，海侵程度都有所增加。由于初级生产驱动着地球系统生物圈功能，人类对净初级生产的占有被认为是生物圈功能完整性的一个控制变量。这一界限也被越过了。气候和陆地系统变化边界的不同程度的海侵的地球系统模拟表明，这些人类活动对地球系统的影响必须在系统的背景下加以考虑。
据介绍，对行星界限框架的更新发现，地球超越了九个界限中的六个，这表明地球现在远在人类的安全操作空间之外。
附：英文原文
Title: Earth beyond six of nine planetary boundaries
Author: Katherine Richardson, Will Steffen, Wolfgang Lucht, Jrgen Bendtsen, Sarah E. Cornell, Jonathan F. Donges, Markus Drüke, Ingo Fetzer, Govindasamy Bala, Werner von Bloh, Georg Feulner, Stephanie Fiedler, Dieter Gerten, Tom Gleeson, Matthias Hofmann, Willem Huiskamp, Matti Kummu, Chinchu Mohan, David Nogués-Bravo, Stefan Petri, Miina Porkka, Stefan Rahmstorf, Sibyll Schaphoff, Kirsten Thonicke, Arne Tobian, Vili Virkki, Lan Wang-Erlandsson, Lisa Weber, Johan Rockstrm
Issue&Volume: 2023-09-13
Abstract: This planetary boundaries framework update finds that six of the nine boundaries are transgressed, suggesting that Earth is now well outside of the safe operating space for humanity. Ocean acidification is close to being breached, while aerosol loading regionally exceeds the boundary. Stratospheric ozone levels have slightly recovered. The transgression level has increased for all boundaries earlier identified as overstepped. As primary production drives Earth system biosphere functions, human appropriation of net primary production is proposed as a control variable for functional biosphere integrity. This boundary is also transgressed. Earth system modeling of different levels of the transgression of the climate and land system change boundaries illustrates that these anthropogenic impacts on Earth system must be considered in a systemic context.
DOI: adh2458
Source: https://www.science.org/doi/10.1126/sciadv.adh2458