| Starless said: This site claims 3% of carbon dioxide emissions come from volcanic activity, with the other 97% coming from human activities. However, it uses a figure of 17.6 billion tons for the amount of CO2 added annually to the atmosphere. Yulegoat's source said it was only 6.1 billion. I'm not sure why the figures are so different, purhaps differing definitions. Anyway, using Yulegoat's figure, volcanic activity accounts for about 9% of total CO2 emissions. |
Your source adds land use to that number, which partly explains the difference. Forests, for example, are major CO2 absorbers. Here's an estimate of how much the deforestation in Amazon produces CO2: http://maps.grida.no/go/graphic/annual_deforestation_in_the_amazon_and_resulting_co2_emissions
It's about 600 million tons of CO2 per year, which is not adequate to explain the difference, but globally speaking, land use may well add up to several billion tons of CO2 per year.
