Humans' global warming impact worse than volcanoes which caused marine extinction 

file image

Ancient global warming caused by volcanic activity may have triggered a deep-sea mass extinction more than 55 million years ago but it doesn't come close to what humans are doing today.

In a study published in the journal Proceedings of the National Academy of Sciences, researchers suggest ancient volcanism sent huge amounts of carbon dioxide into the atmosphere during that time, which was then absorbed by the oceans over thousands of years.