Warning Signs of Collapse
Chaos, then catastrophe. Researchers have found that one of the signs that an ecosystem is about to collapse is that things become more volatile—for instance, the amount of chlorophyll in a lake rapidly spikes and plunges. Global climate change is causing something similar: extreme weather events like hurricanes and droughts have grown more frequent. Even flights are facing more turbulence. Discuss with your team: what should we do if the climate passes a point of no return? Would it be okay to spend fewer resources on fighting climate change if the battle is already lost?
Before a lake's ecosystem crashes, its chlorophyll starts spiking and plunging wildly. The same telltale volatility precedes a stock-market crash or an epileptic seizure. Now the climate is flashing the symptom too — more frequent hurricanes and droughts, even bumpier flights. Rising chaos is the alarm bell before catastrophe.
Key concepts
- Rising Variance (critical Slowing Down)
- A system nearing collapse fluctuates more wildly before it breaks — like a lake's chlorophyll swinging up and down; scientists use this growing instability as an early-warning sign.
- Tipping Point
- A threshold past which change becomes self-sustaining and abrupt — cross it and the system reorganizes on its own, like the collapse of the Atlantic current (AMOC) that could freeze northern Europe.
- Point Of No Return
- Irreversibility — the moment a change can no longer be undone on any human timescale; the climate debate turns on whether and when we cross such thresholds.
- Overshoot
- Temporarily exceeding a safety limit (like 1.5°C) hoping to come back under it — but 'every degree and every year' above the threshold matters; overshoot isn't free, even if reversed.
What to know
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Instability itself is the warning — systems on the edge of collapse fluctuate more before they break, so the growing wildness of weather may be the climate's version of the chlorophyll spikes that precede a lake's crash.
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