Tiny fossils at the bottom of the ocean may hold the clues to Earth’s mysterious ‘100,000 year problem.’
The history of our planet is marked by periodic plunges in and out of ice ages every 100,000 years, starting about a million years ago in what’s known as the Mid-Pleistocene Transition.
Before this, the phenomenon occurred more frequently, blanketing the Northern Hemisphere in vast ice sheets every 40,000 years.
Now, an analysis has revealed evidence of an abundance of CO2 stored deep in the ocean during the 100,000 year intervals, suggesting extra carbon dioxide was sequestered during these periods, lowering the temperature on Earth.
Researchers now say the oceans could be to blame for 100,000 year ice age intervals.