What creates more co2 a volcano or the human race.?
Humans have been releasing more CO2 in to the atmosphere than all natural sources combined since about 1900. Our annual output is about is currently 6 billion tons/year and rising, which is about 40 times more than volcanoes. From Wikipedia: Volcanic activity releases about 130 to 230 teragrams (145 million to 255 million short tons) of carbon dioxide each year. and: Since ~1900, the flux of carbon entering the atmosphere from fossil fuel consumption has exceeded the net flux of carbon from all sources, indicated that the sum of all other impacts on the carbon cycle has been acting as a net sink, and serving to sequester some of the carbon being released from fossil fuel consumption.
