Some scientists are becoming clam 'whisperers' to better predict when our planet's climate will tip over into dangerous territory.
Clam shells are only a proxy for past climates in the marine setting, but they are quite reliable.
Relying on these measures, researchers have now found a consistent pattern in long-lived, deep-sea clams that suggests a weakening of the North Atlantic's subpolar currents on two occasions. In the interval between these episodes, shell growth and carbon isotopes in the clams suggest the ecosystem kept pace with the environmental changes. But during the second episode, the authors observed a decline in shell growth starting around 1300 CE.
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