Comments on “Components of CO2 in 1750 through 2018 Corrected for the Perturbation of the 14CO2 Bomb Spike”

Abstract

Comments on "Components of CO 2 in 1750 through 2018 Corrected for the Perturbation of the 14 CO 2 Bomb Spike" Dear Editors: A paper in this journal analyzing atmospheric radiocarbon specific activity by Skrable et al. (February 2022) (hereinafter "Skrable 1") attracted multiple critical letters by atmospheric scientists and others. One of those letters by Schwartz et al. (2022) made four arguments against the paper, briefly summarized here as: 1. Use of erroneous data on atmospheric CO 2 history; 2. Neglect of the "bomb carbon;" 3. Failure to account for isotope exchange between the atmosphere and other reservoirs; and 4. Neglect of other lines of evidence that fossil fuel emissions are the source of atmospheric CO 2 rise.