CORRESPONDENCEResponse to Letters from Andrews and Tans, Edwards, and Musolino commenting on Skrable et al.—“World Atmospheric CO2, Its 14C Specific Activity, Non-fossil Component, Anthropogenic Fossil Component, and Emissions (1750–2018)”Ulsh, Brant Author Information Health Physics Editor-In-Chief [email protected] (513) 805–3445 The author declares no conflicts of interest. Health Physics: June 2022 - Volume 122 - Issue 6 - p 721-722 doi: 10.1097/HP.0000000000001573 Buy Metrics Copyright © 2022 Health Physics Society