Pliocene (42–46). References and Notes

CO2 levels over the past 2.1 My but rather an in-tensification of PCO2 drawdown in glacial periods toward the present, as would be inferred from the asymmetrical evolution of our continuous tropical temperature stack (Fig. 3). Provided that consistent, orbital-resolution paleo-CO2 reconstructions can be obtained in the future, our tropical temperature stack can help to constrain the equilibrium sen-sitivity of tropical climate to CO2 forcing over