# past the point of no return (threshold)

*Ordinarily means:* a point beyond which things cannot be undone

Crossing a wall where drift can no longer be reversed because maintenance has ceased and the parameter has moved too far.

- Computed level: L15 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: EmergenceLexicon  ·  Arena: everyday language

## Emergence
**Emerges from:** [wall](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-wall.range-end), [drift](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-drift.aimless), [maintenance](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-maintenance.upkeep), [parameter](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-parameter.condition)

**Through:** crossing without removal

**Novel properties:**
- irreversibility
- point_of_no_return

## Examples
- The 2008 collapse of Lehman Brothers accelerated a financial cascade that central banks could no longer contain with routine interventions. *(economics)*
- By 2011, the Fukushima Daiichi nuclear plant had cooled enough that restarting fission was impossible without full core replacement. *(engineering)*
- After the Aral Sea's diversion for irrigation, salinity passed 100 g/L, killing all fish species by 2006. *(ecology)*

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*Canonical: https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-past-the-point-of-no-return.threshold*  
*Structured data: https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-past-the-point-of-no-return.threshold.json*  
*Every definition provably resolves to space, time, energy and pattern.*