Meteorite caused extinction

 Science Daily:

Massive volcanic eruptions on the Indian peninsula have long been proposed as an alternative cause for the demise of the dinosaurs. This phase of active volcanism took place in a period just before the Earth was struck by a meteorite, 66 million years ago. The effect of these volcanic eruptions on the Earth's climate has been topic of fierce scientific debates for decades. Now, climate scientists from Utrecht University and the University of Manchester show that, while the volcanism caused a temporary cold period, the effects had already worn off thousands of years before the meteorite impacted. The scientists therefore conclude that the meteorite impact was the ultimate cause of the dinosaur extinction event.

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The report does not indicate whether Earth was populated with humans at that time.  Some science fiction has suggested that humans and dinosaurs populated the earth at the same time.  If they did the humans were not writing history books at that time. 

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