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 dies it starts swinging. Before a market crashes it does the same. The warning is not the level of anything — it is how wildly the level moves.

Key concepts

Tipping Point: A threshold past which change feeds itself: cross it and the system moves to a new state on its own, and pushing back no longer undoes it. A glass tipped past its balance point falls, whether or not you keep pushing.

Every work — at a glance

The Bass in the Lake — Jonathan Cole and colleagues (study)

Researchers pushed a Wisconsin lake over the edge deliberately by adding bass, then watched for the signal that the collapse was coming.

+ 10 more works explained inside

What to know

01
What if the climate passes a point of no return — do we stop fighting? The science cuts against surrender: because harm scales with every degree and every year of overshoot, 'the battle is lost' is never all-or-nothing — there is always a worse outcome left to prevent, so effort still buys a less-bad world even past a threshold.

Across subjects

The same early-warning signal shows up in economics: the rising variance and 'critical slowing down' that precede a lake's collapse also precede a market crash

Theme connection

"Are We There Yet?"

The question turns terrifying when 'there' is a point of no return. Does an early-warning system spur action, or excuse surrender? The same rising chaos that could rally us to act can also be read as proof it's too late to bother — the alarm and the white flag look alike.

Practice — a sample

SOCConcorde's partners kept paying so the spending would not be wasted. Which MOST strongly supports cutting emissions anyway?

A Rising future harm
B Money already spent
C Reversible tipping points
D Early enough warnings
E Other countries acting

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