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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 estimate includes both subaerial and submarine volcanoes, about in equal amounts. Emissions of CO2 by human activities,
including fossil fuel burning, cement production, and gas flaring, amount to about 22 billion tonnes per year (24 billion tons)
[ ( Marland, et
al., 1998) - The reference gives the amount of released carbon (C), rather than CO2.]. Human activities release more than 150 times the amount of
CO2 emitted by volcanoes--the equivalent of nearly 17,000 additional volcanoes like Kilauea (Kilauea emits about 13.2 million tonnes/year)!
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Present-day carbon dioxide (CO2) emissions from subaerial and submarine volcanoes are uncertain at the present time. Gerlach (1991) estimated a total
global release of 3-4 x 10E12 mol/yr from volcanoes.
This is a conservative estimate. Man-made (anthropogenic) CO2 emissions overwhelm this
estimate by at least 150 times.
by the way could some one help me with their equation??
3-4 x 10E12 mol/yr
whats E for starters :eruption, emission, e-somthing??
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Since 1751 roughly
305 billion tons of carbon have been released to the atmosphere from the consumption of fossil fuels and cement production.
Half of these emissions have occurred since the mid 1970s. The 2003 global fossil-fuel CO2 emission estimate,
7303 million metric tons of
carbon, represents an all-time high and a 4.5% increase from 2002.
Globally, liquid and solid fuels accounted for 76.7% of the emissions from fossil-fuel burning in 2003. Combustion of gas fuels (e.g., natural gas)
accounted for 19.2%
(1402 million metric tons of carbon) of the total emissions from fossil fuels in 2003 and reflects a gradually increasing
global utilization of natural gas. Emissions from cement production
(275 million metric tons of carbon in 2003) have more than doubled since
the mid 1970s and now represent 3.8% of global CO2 releases from fossil-fuel burning and cement production. Gas flaring, which accounted for roughly
2% of global emissions during the 1970s, now accounts for less than 1% of global fossil-fuel releases.
that seems fishy to me
Emissions of CO2 by human activities, including fossil fuel burning, cement production, and gas flaring, amount to about 22 billion tonnes per year
(24 billion tons)
if the above inculdes fossil fuels and so on what are they including it in to???
human activity?? how specific or vague can that be???
[edit on 6/2/07 by Glyph_D]
