Tipping Points in the Earth System: Cascade Risk and the Irreversibility Threshold
Objective
Identify and quantify the proximity of major Earth system tipping points, assess their interdependencies, and model the probability of irreversible cascade failures under current warming trajectories.
Methodology
Systematic review of 127 tipping element studies, integrating paleoclimate data with Earth System Models (ESMs). Cascade risk modeled using network analysis of tipping point interactions across cryosphere, biosphere, and ocean circulation systems.
Findings
2°C). Five are classified as high-risk below 2°C: West Antarctic Ice Sheet collapse, Greenland Ice Sheet loss, Amazon dieback, Atlantic Meridional Overturning Circulation (AMOC) weakening, and boreal permafrost thaw. Most critically, tipping elements interact: AMOC weakening accelerates Amazon dieback; Amazon dieback releases carbon accelerating permafrost thaw.
0°C of self-reinforcing warming independent of human emissions. 5-2°C — a threshold current pledges will breach by 2035-2040.
Key Assumptions
- •Tipping thresholds estimated from paleoclimate proxies and models carry ±0.3°C uncertainty.
- •Cascade timelines operate on decadal-to-century scales once initiated.
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Evaluation Scores
Data Sources
Science — Hothouse Earth: Trajectories of the Earth System in the Anthropocene 2022
academic
Reliability: 97%