Overkill, Overchill, Overill? Megafaunal extinction causes

http://discovermagazine.com/...the-great-american-extinctionWhat Caused the Great American Extinction? A comet may have decimated native animals”and culture. - By Jessica RuvinskyExcerpt from a short article:

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Becker, along with two dozen-odd scientists, is studying a thin 12,900-year-old geologic layer across North America that she believes holds the legacy of a major extraterrestrial impact roughly half the size of the one that killed the dinosaurs.

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"Meteor impact" strikes again!Moose

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Professor, geology, Whatsamatta U
Evolution - Changes in the environment, caused by the interactions of the components of the environment. "Do not meddle in the affairs of cats, for they are subtle and will piss on your computer." - Bruce Graham

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"The modern conservative is engaged in one of man's oldest exercises in moral philosophy; that is, the search for a superior moral justification for selfishness." - John Kenneth Galbraith

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"Nixon was a professional politician, and I despised everything he stood for ” but if he were running for president this year against the evil Bush-Cheney gang, I would happily vote for him." - Hunter S. Thompson

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"I know a little about a lot of things, and a lot about a few things, but I'm highly ignorant about everything." - Moose

While you certainly raise some interesting points, I think most of them do not belong in this topic, which should focus on the Pleistocene extinction event(s).A couple of new topics probably should be started:1) "Science by Press Release", destined for the "Is It Science?" forum.2) "Extraterrestrial Sourced Impacts and Extinction Events", destined probably for the "Miscellaneous Topics in Creation/Evolution" forum.Maybe someone would like to do a message 1 proposing such topics. Titles above are only my offhand suggestions.That said, I don't find a major conflict between the Discover version and your cited NSF version of the story. Either/both are throwing out a hypothesis, and I don't think they are trying to oversell the idea. Which isn't to say that someone might try to overextend the information of those articles. But now I'm getting into a new topic time area.Moose