Hey, I heard volcanoes release more carbon dioxide than human activities-is that true?
No...and it's not even close. We spoke with Dr. Amy Snover of the UW Climate Impacts group. She tells us that volcanoes release an average of just 3/10's of a billion tonnes each year, while human activities release 29 billion tonnes. So volcanic CO2 is just one percent of the CO2 released by humans. By the way, the word 'tonnes' is not mis-spelled-it refers to metric tons and is roughly equal to 2200 pounds.