Notre planète fonce vers un point de rupture qui déboucherait sur un scénario catastrophe irréversible. C’est l’avertissement lancé par des chercheurs internationaux dans une nouvelle étude sur le climat, publiée lundi dans la revue Proceedings of the National Academy of Sciences
Trajectories of the Earth System in the Anthropocene - Steffen et al 2018 Trajectories of the Earth System in the Anthropocene_0.pdf
▻https://liverman.faculty.arizona.edu/sites/liverman.faculty.arizona.edu/files/2018-08/Steffen+et%20al%202018%20Trajectories%20of%20the%20Earth%2
We explore the risk that self-reinforcing feedbacks could push the Earth System toward a planetary threshold that, if crossed, could
prevent stabilization of the climate at intermediate temperature rises and cause continued warming on a“Hothouse Earth” pathway even as
human emissions are reduced. Crossing the threshold would lead to
a much higher global average temperature than any interglacial in
the past
1.2 million years and to sea levels significantly higher than at any time in the Holocene. We examine the evidence that such a threshold
might exist and where it might be. If the threshold is crossed, the
resulting trajectory would likely cause serious disruptions to ecosystems, society, and economies. Collective human action is
required to steer the Earth System away from a potential threshold
and stabilize it in a habitable interglacial-like state. Such action
entails stewardship of the entire Earth System and could include
decarbonization of the global economy, enhancement of biosphere
carbon sinks, behavioral changes, technological innovations, new
governance arrangements, and transformed social values.