CBS Evening News for Monday, Jul 28, 2014
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(Chicago: Dean Reynolds) The theory that dinosaurs were killed off by an asteroid that struck at a time when they were very vulnerable reviewed; details given about a study finding that the earth is undergoing the 6th mass extinction in its history due to climate change and reckless land management. [Paleontologist Stephen BRUSATTE- says dinosaurs tell us that groups that have been dominant can suddenly disappear when times go bad.]
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