Carbon dioxide forcing alone insufficient to explain Palaeocene–Eocene Thermal Maximum warming

@article{Zeebe2009CarbonDF,
  title={Carbon dioxide forcing alone insufficient to explain Palaeocene–Eocene Thermal Maximum warming},
  author={Richard E. Zeebe and James C. Zachos and Gerald R. Dickens},
  journal={Nature Geoscience},
  year={2009},
  volume={2},
  pages={576-580}
}
About 55 million years ago global surface temperatures increased by 5–9 ∘C within a few thousand years, following a pulse of carbon released to the atmosphere. Analysis of existing data with a carbon cycle model indicates that this carbon pulse was too small to cause the full amount of warming at accepted values for climate sensitivity. 
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