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Ursprungligen postat av hdavidsson
Nej!
Vulkaner står för ett par procent. Tyvärr kan vi inte skylla på vulkanerna.
Källa?
Tvärt om så menar ju forskare att vulkaner kan spy och bevisligen spyr ut betydande mängder växthusgaser (däribland metan, CO2, svavelföreningar och annat).
Goff et al, 2002, Passive infrared remote sensing evidence for large, intermittent CO2 emissions at Popocatépetl volcano in Mexico, Chemical Geology:
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We estimate that the average CO2/SO2 ratio for the period was about 23, yielding an average CO2 flux of roughly 38,000 t/day
Etiope et al, 2002, Methane emission from the mud volcanoes of Sicily (Italy), Geophys. Res. Lett
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Soil CH4 flux is positive even at large distances from the mud volcano fields suggesting a diffuse microseepage over wider areas. A total of at least 400 tons CH4 per year can be estimated over the area investigated alone (~1.5 km2).
Kopf, 2003, Global methane emission through mud volcanoes and its past and present impact on the Earth's climate, International Journal of Earth Sciences
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Mud volcanism is an abundant, global phenomenon whereby fluid-rich, low-density sediments extrude both on land and offshore. Methane, which generally exceeds 90 vol% of the gas phase, is emitted at high rates during and after emplacement of the mud domes and is known for its high global warming potential (GWP). This comprehensive estimate of the annual contribution of mud volcano degassing assesses the significance of mud volcanism for the accumulation of greenhouse gases in the atmosphere. A first-order estimate for the earlier, pre-anthropogenic volume of methane released through mud volcanoes further supports their profound effect on the Earth''s climate since at least the Paleozoic (570 Ma).
Så forskare skyller ju uppenbarligen på vulkanerna samt har styrkt deras utsläpp av växthusgaser och förmodade effekt på klimatet...
