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Is Fossil Fuel CO2 Different From Volcanic CO2?

Natural CO2 Molecule

CO2 From A Jet Engine

We have all seen lots of pictures of the Eyjafjallajokull eruption now, with steam and ash billowing up in the air. The eruption started one month ago, and as the GuardianreportsThe eruption of the Eyjafjallajokull volcano is unlikely to have any significant impact on climate but has caused a small fall in carbon emissions, experts say.
The Guardian editors seem to have forgotten that the volcano itself is spewing massive amounts of CO2 in the atmosphere. Perhaps their kinship with Plane Stupidis having an impact? Plane Stupid’s goal is to stop plane traffic in the UK, and they must be thrilled by the flight ban and the damage to the economy.
Volcano CO2 budget (CO2 is emitted independent of ash) ~200,000 tons per day X 30 days of eruption = 6,000,000 tons of CO2.
Plane CO2 Budget – assumes half of EU planes haven’t flown for the past six days 340,000 EU tons per day X 0.5 EU shutdown X 6 days = ~1,000,000 tons of savings.
People using alternative transportation (as Anthony and the BBC pointed out) as a replacement for aircraft – cars, trains, battleships , etc. ~1,000,000 tons of extra CO2 Is a battleship more “green” than a jumbo jet?
The total gain is 6,000,000 – 1,000,000 + 1,000,000 = 6,000,000 tons of excess CO2 from the volcano. The temporary aircraft shutdown has little or no net impact on CO2 emissions, but the volcano has a large impact.

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