The life span of the biosphere revisited

@article{Caldeira1992TheLS,
  title={The life span of the biosphere revisited},
  author={Ken Caldeira and James F. Kasting},
  journal={Nature},
  year={1992},
  volume={360},
  pages={721-723}
}
A DECADE ago, Lovelock and Whitfield1 raised the question of how much longer the biosphere can survive on Earth. They pointed out that, despite the current fossil-fuel induced increase in the atmospheric CO2 concentration, the long-term trend should be in the opposite direction: as increased solar luminosity warms the Earth, silicate rocks should weather more readily, causing atmospheric CO2 to decrease. In their model1, atmospheric CO2 falls below the critical level for C3 photosynthesis, 150… 
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