Overestimated global warming over the past 20 years

@article{Fyfe2013OverestimatedGW,
  title={Overestimated global warming over the past 20 years},
  author={John C. Fyfe and Nathan P. Gillett and Francis W. Zwiers},
  journal={Nature Climate Change},
  year={2013},
  volume={3},
  pages={767-769},
  url={https://api.semanticscholar.org/CorpusID:11304061}
}
Recent observed global warming is significantly less than that simulated by climate models. This difference might be explained by some combination of errors in external forcing, model response and internal climate variability. 

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