They say that their observations and interpretations cannot be adequately explained by volcanic, anthropogenic, or other natural processes. They contend that extinction of megafauna was synchronous with associated effects on prehistoric human societies. Proponents believe that certain microscopic debris is evidence of impact and that 'black mats' of sediment are evidence of widespread fires.

A further editorial response will follow the resolution of these issues.' Evidence Įxamples of meltglass from Tell Abu Hureyra On February 15, 2023, the following editor’s note was posted on this paper, 'Readers are alerted that concerns raised about the data presented and the conclusions of this article are being considered by the Editors. Subsequent concerns that have been brought up in PubPeer have not yet been addressed by the CRG, including discrepancies between claimed blast wave direction compared to what the images show, unavailability of original image data to independent researchers, lack of supporting evidence for conclusions, inappropriate reliance on young Earth creationist literature, misinformation about the Tunguska explosion, and another uncorrected example of an inappropriately altered image. Five of the paper's 53 images received retouching to remove labels and arrows present in other published versions of the photos, which Bik believed to be a possible conflict with Scientific Reports' image submission guidelines but was not in itself a disproval of the Tall el-Hammam airburst theory. CRG members initially denied tampering with the photos but eventually published a correction in which they admitted to inappropriate image manipulation. Image forensics expert Elisabeth Bik discovered evidence for digital alteration of images used as evidence for the claim that the village of Tall el-Hammam was engulfed by an airburst. Many doubts have been raised about several of the CRG's other claims. For example, physicist Mark Boslough, a specialist in planetary impact hazards and asteroid impact avoidance, has pointed out many problems with the credibility and motivations of individual CRG researchers and also with their specific claims for evidence in support of the YDIH and/or the effects of meteor air bursts or impact events on ancient settlements, people, and environments.

Members of this group have been criticized for promoting pseudoscience, pseudoarchaeology, and pseudohistory, engaging in cherry-picking of data based on confirmation bias, seeking to persuade via the bandwagon fallacy, and even engaging in intentional misrepresentations of archaeological and geological evidence. The hypothesis is not widely accepted by relevant experts. Some YDIH proponents have also proposed that this event triggered extensive biomass burning, a brief impact winter and the Younger Dryas abrupt climate change, contributed to extinctions of late Pleistocene megafauna, and resulted in the end of the Clovis culture. Advocates proposed the existence of a Younger Dryas boundary (YDB) layer that can be identified by materials they interpret as evidence of multiple meteor air bursts and/or impacts across a large fraction of Earth’s surface. The YDIH posits that fragments of a large (more than 4 kilometers in diameter), disintegrating asteroid or comet struck North America, South America, Europe, and western Asia around 12,850 years ago, coinciding with the beginning of the Younger Dryas cooling event. The Younger Dryas impact hypothesis (YDIH) or Clovis comet hypothesis is a speculative attempt to explain the onset of the Younger Dryas (YD) as an alternative to the long-standing and widely accepted cause due to a significant reduction or shutdown of the North Atlantic 'Conveyor' in response to a sudden influx of freshwater from Lake Agassiz and deglaciation in North America. ( Learn how and when to remove this template message) ( October 2022) ( Learn how and when to remove this template message) Please help improve it to make it understandable to non-experts, without removing the technical details. This article may be too technical for most readers to understand.

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