Geobiological constraints on Earth system sensitivity to CO2 during the Cretaceous and Cenozoic

  title={Geobiological constraints on Earth system sensitivity to CO2 during the Cretaceous and Cenozoic},
  author={Dana L. Royer and Mark Pagani and David J. Beerling},
Earth system climate sensitivity (ESS) is the long‐term (>103 year) response of global surface temperature to doubled CO2 that integrates fast and slow climate feedbacks. ESS has energy policy implications because global temperatures are not expected to decline appreciably for at least 103 year, even if anthropogenic greenhouse gas emissions drop to zero. We report provisional ESS estimates of 3 °C or higher for some of the Cretaceous and Cenozoic based on paleo‐reconstructions of CO2 and… 

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