A vast ocean current system that shapes climate may be slowing. Studies suggest the Atlantic overturning circulation has weakened and could be approaching a tipping point. A collapse would carry sweeping consequences.
A climate conveyor
The system is huge. Warm and cold water circulate between the tropics and poles. It moderates climate.
Signs of slowing
Evidence accumulates. Proxy records indicate a weakening trend. Concern is rising.
Tipping risk
Nonlinearity worries scientists. The circulation could shift abruptly, not gradually. Thresholds may exist.
Wide impacts
Stakes are broad. Weakening would alter weather across continents. Effects ripple far.
Deep uncertainty
Caution is essential. Timing and likelihood remain debated. Models disagree.
Close monitoring
Watch continues. Arrays measure the current directly. Data improve each year.
The bottom line
Studies suggest the Atlantic overturning circulation is weakening and may near a tipping point. A collapse would reshape global weather. Timing remains uncertain, and monitoring is intensifying.
