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42,000 Years Ago A Massive Geomagnetic Shift Plunged A Warm Earth Into An Ice Age...But CO₂ Didn't Budge

42,000 Years Ago A Massive Geomagnetic Shift Plunged A Warm Earth Into An Ice Age…But CO₂ Didn’t Budge

A groundbreaking new study in Science suggests warm interglacial-like conditions (surface temperatures within 1°C of today’s) persisted from 54 to 42,000 years ago even though CO₂ levels idled around 200 ppm at that time. A sudden geomagnetic shift that intensified galactic cosmic rays and cloud formation and reduced ozone levels ~42,000 years ago resulted in […]

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