While geomagnetic reversals have occurred numerous times, there is little evidence to suggest that these events have had catastrophic consequences for life on Earth. The magnetosphere may weaken during a reversal, but it does not disappear entirely. During the flip, the Earth would be less protected from solar radiation, which could increase cosmic radiation levels. However, the atmosphere offers significant protection, and life on Earth has survived numerous reversals in the past.
Recent studies have also pointed out that the Earth’s climate may not be directly impacted by geomagnetic reversals. However, scientists remain cautious, acknowledging that there could be unknown effects that have yet to be understood.