Does pre-industrial warming double the anthropogenic total?

@article{Ruddiman2014DoesPW,
  title={Does pre-industrial warming double the anthropogenic total?},
  author={William F. Ruddiman and Stephen J. Vavrus and John E. Kutzbach and Feng He},
  journal={The Anthropocene Review},
  year={2014},
  volume={1},
  pages={147 - 153}
}
According to the early anthropogenic hypothesis, land clearing and agriculture caused emissions of greenhouse gases to begin to alter climate as early as 7000 years ago (Ruddiman, 2003). Climate-model simulations based on the CO2 and CH4 concentrations proposed in the hypothesis suggest that humans caused a global mean warming of 0.9 to 1.5°C before the start of the industrial era. Additional pre-industrial effects on land surface reflectance (changes in albedo resulting from forest clearance… 

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