https://www.atlasobscura.com/articles/colonization-antarctica-ice

Correlation does not equal causation, and King is leaning on correlation and, worse, inference. Ice cores can, yes, provide some interesting data on CO2 ratios and, very broadly, trends in temperature. But that's quite a lateral arabesque to go from "CO2 ratios changing," which has happened continually since the Earth formed, and "CO2 ratios changing due to human activity," which to my modest scientific background can't be concluded from the data presented here.

Science is supposed to be data-driven. If one's data doesn't support the hypothesis, one changes the hypothesis and then it's back to the drawing board. This article - not a peer-reviewed journal article, but a consumer piece for popular consumption - makes a lot of logical leaps that the data and the original study just don't appear to support.