A predictable side effect of the eruption of the Eyjafjallajökull volcano in Iceland on 14 April 2010 was significant air traffic disruptions all across Europe, the largest airline shutdown since WW II.A less obvious result is that the carbon dioxide emissions regularly caused by these flights have been suspended, and even though the volcano is emitting 15,000 tons of carbon dioxide daily (small red triangle), that's still far less than the airline traffic regularly generates (giant red triangle).
image from: http://www.informationisbeautiful.net/2010/planes-or-volcano/
data from: http://bit.ly/planevolcano
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