The Anthropogenic Greenhouse Era Began Thousands of Years Ago

@article{Ruddiman2003TheAG,
  title={The Anthropogenic Greenhouse Era Began Thousands of Years Ago},
  author={William F. Ruddiman},
  journal={Climatic Change},
  year={2003},
  volume={61},
  pages={261-293}
}
  • W. Ruddiman
  • Published 1 December 2003
  • Environmental Science
  • Climatic Change
The anthropogenic era is generally thought to have begun 150 to 200 years ago, when the industrial revolution began producing CO2 andCH4 at rates sufficient to alter their compositions in the atmosphere. A different hypothesis is posed here: anthropogenic emissions of these gases first altered atmospheric concentrations thousands of years ago. This hypothesis is based on three arguments. (1) Cyclic variations in CO2 andCH4 driven by Earth-orbital changes during the last 350,000 years predict… 
Commentary on “The Anthropogenic Greenhouse Era Began Thousands of Years Ago”
Bill Ruddiman (Climatic Change, 61, 261–293, 2003) recently suggested that early civilisations could have saved us from an ice age because land management over substantial areas caused an increase in
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This work shows that climate and wetland simulations of the global methane cycle over the last glacial cycle (the past 130,000 years) recreate the ice core record and capture the late Holocene increase in methane concentrations, and indicates that the lateHolocene increase results from natural changes in the Earth's orbital configuration.
Does pre-industrial warming double the anthropogenic total?
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).
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  • R. Lal
  • Environmental Science
  • 2014
The threat of abrupt climate change by increase in atmospheric concentration of CO2 and other greenhouse gases has enhanced the interest and urgency of identifying strategies for reducing and
The Early Anthropogenic Hypothesis a Year Later
Ruddiman (2003) introduced a three-part hypothesis on early anthropogenic influences on late Holocene climate. He proposed that humans reversed a natural decrease in atmospheric CO2 values 8000 years
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