Making the paper: David Frank.

The article discusses the study of David Frank, a climatologist at the Swiss Federal Research institute to determine the effect of carbon dioxide emissions in the atmosphere. It mentions that Frank and his colleagues obtained carbon dioxide records from three Antarctic ice cores and combined data from nine large-scale temperature reconstructions. It notes that they were able to calculate more than 200,000 estimates of how carbon dioxide varied in response to temperatures between 1050 and 1800.