Daily Junction.mobi portalThe IPCC also noted that tipping points are under-represented in climate models used to project future warming, because the models are based on gradual, linear responses and struggle to capture abrupt, non-linear changes. This means that IPCC projections may underestimate the risk of extreme warming scenarios driven by tipping points.
The only way to reduce tipping point risks is to limit warming as much as possible, as quickly as possible. Every tenth of a degree matters, because tipping points have thresholds—1.6°C of warming is riskier than 1.5°C, and 2°C is riskier still.
The Paris Agreement's goal of limiting warming to 1.5-2°C was explicitly designed to reduce tipping point risks, based on the science available in 2015. Since then, the science has become clearer and more alarming—some tipping points may be triggered at lower warming levels than previously thought, and the risk of cascades is better understood.
Limiting warming to 1.5°C would significantly reduce the risk of triggering the Amazon, AMOC, and East Antarctic tipping points, though it may not prevent Greenland, West Antarctic, and coral reef tipping points, which may already be in progress. Limiting warming to 2°C increases the risk of Amazon and AMOC tipping points but is still far safer than 3°C or 4°C, where multiple tipping points become likely.
Beyond emissions reductions, some scientists are exploring interventions to stabilise tipping elements—for example, artificially cooling the Arctic to preserve sea ice, or engineering the AMOC to prevent collapse. These are speculative and carry their own risks, but they may become necessary if tipping points are crossed.
Climate tipping points are critical thresholds where small additional warming triggers large, often irreversible changes in Earth systems. Scientists have identified at least 16 potential tipping points, including collapse of the Greenland and West Antarctic ice sheets, Amazon rainforest dieback, and shutdown of Atlantic ocean currents. Five tipping points may already be in their activation phase at current warming levels (1.2°C above pre-industrial), including Arctic sea ice loss and coral reef die-off. Crossing multiple tipping points could create cascading effects, where one tipping point triggers others, potentially pushing Earth into a "hothouse" state with 4-5°C or more of warming. Limiting warming to 1.5-2°C reduces but does not eliminate tipping point risks; some may be triggered even at current warming levels. The only way to reduce tipping point risks is to cut emissions as quickly as possible—every tenth of a degree of warming avoided reduces the likelihood of crossing irreversible thresholds.