I was wrong in Cynthia's post about CO2 and global warming.
http://volcanoes.usgs.gov/Hazards/What/VolGas/volgas.html "Comparison of CO2 emissions from volcanoes vs. human activities. Scientists have calculated that volcanoes emit between about 130-230 million tonnes (145-255 million tons) of CO2 into the atmosphere every year (Gerlach, 1999, 1992). This... Sign in to see full entry.