Climate Tipping Points: What the Science Actually Says

Most climate change is gradual, but parts of the system have thresholds — tipping points — beyond which change becomes self-sustaining and very hard to reverse.

What is a tipping point?

A tipping point is a critical threshold where a small additional push triggers a large, often abrupt shift in a system. Melting ice and thawing permafrost are classic examples.

• Ice sheets that pass a melt threshold may not regrow for millennia.
• Thawing permafrost releases greenhouse gases that warm the planet further.
• Forests can shift abruptly from carbon sinks to carbon sources.

“Avoiding tipping points means acting before, not after, they are crossed.”

— Earth System Dynamics

The science is sobering but not hopeless. Every fraction of a degree of warming avoided reduces the risk of crossing these thresholds — which is exactly why rapid action matters now.