I often have arguments with climate change deniers and one thing they
constantly bring up is that volcanoes release more carbon dioxide than
humans. Whenever I ask for evidence I usually get abuse. For anyone
who had gone through the same experience here is a website to back up
the idea that humans produce mre greenhouse gases than volcanoes.
http://hvo.wr.usgs.gov/volcanowatch/2007/07_02_15.html
Cheers