Ecosystem Resilience and Critical Thresholds

Consider a complex environmental system, such as a polar ice cap, that is in a stable, high-volume state. If underlying environmental conditions change such that the critical threshold (or 'tipping point') for irreversible collapse moves closer to the system's current stable state, what is the most likely implication for the system's stability?

Vulnerability to Minor Environmental Shocks

Imagine a large glacier system that is currently in a stable, high-ice state. If gradual, long-term warming causes the critical threshold for irreversible melting (the 'tipping point') to move closer to the glacier's current state, this implies that the system has become more resilient and would now require a more extreme and prolonged heatwave than before to trigger a rapid, self-sustaining collapse.

Consider two states of a large polar ice sheet. In State A, the system is stable, and the threshold for triggering a rapid, self-sustaining melt is far from its current condition. In State B, due to long-term environmental changes, this same threshold is now significantly closer to the ice sheet's current condition. If both states are subjected to an identical, moderately severe heatwave, what is the most likely outcome?

Evaluating Climate System Vulnerability

An environmental system's vulnerability to collapse depends on the distance between its current stable state and a critical 'tipping point'. Match each system scenario with the most likely outcome following an identical, minor, short-term negative shock (e.g., a single unusually warm year).

Critique of a Climate Risk Model

Consider a large arctic ice sheet system where, due to long-term warming, the critical threshold for irreversible, self-sustaining melt has moved closer to its current stable state. If this system now experiences a single, unusually warm summer—a shock that in the past would have caused only temporary melting—what is the most likely new outcome?

The 'One Bad Summer' Effect