Wolbach et al. published two papers on the Younger Dryas Impact Hypothesis (YDIH)—the
paleoenvironmental effects of a purported cosmic impact at the beginning of the Younger
Dryas Chronozone (YDC). Part 1 includes a selective summary of previous discussions of
the YDIH but leaves out key reviews, uncritically accepts previous interpretations of
purported impact, and fails to take into account abundant criticisms and contradictory data. A
discussion of icecore evidence focuses only on the beginning of the YDC rather than on a …

New hypotheses with major multidisciplinary implications, such as the Younger Dryas
airburst/impact hypothesis, appropriately face intense testing, and we respect that. However,
such criticisms must be based on facts. Instead, many of the assertions made in the
discussion by Holliday and coauthors are inaccurate. In this article, we present rebuttals of
the most significant of their inaccurate assertions but decline to address unfounded
opinions. Most of the following discussion deals with the implications of the Younger Dryas …