It is generally accepted that declining carbon dioxide (CO2) levels were an important factor in the Eocene–Oligocene transition about 34 million years ago, when the world shifted from a greenhouse to an icehouse climate. Here, using the boron isotope pH proxy on carbonate microfossils from a recently discovered geological section in Tanzania, atmospheric CO2 levels before, during and after the climate transition are estimated.
- Paul N. Pearson
- Gavin L. Foster
- Bridget S. Wade