Attribution of observed surface humidity changes to human influence

@article{Willett2007AttributionOO,
  title={Attribution of observed surface humidity changes to human influence},
  author={Katharine M. Willett and Nathan P. Gillett and Philip D. Jones and Peter William Thorne},
  journal={Nature},
  year={2007},
  volume={449},
  pages={710-712}
}
Water vapour is the most important contributor to the natural greenhouse effect, and the amount of water vapour in the atmosphere is expected to increase under conditions of greenhouse-gas-induced warming, leading to a significant feedback on anthropogenic climate change. Theoretical and modelling studies predict that relative humidity will remain approximately constant at the global scale as the climate warms, leading to an increase in specific humidity. Although significant increases in… 

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