As AFP (Link in title) points out today, the Iceland Volcano Eyjafjallajökull is emitting up to 300,000 tons of carbon dioxide per day, which, if extrapolated to an annual amount (15 million tons) would be similar to the emissions of Austria, Belarus,Denmark or Portugal.
However, as the UK Times on line points out, The grounding of 63,000 flights over the past four days has saved 1.3 million tonnes of carbon dioxide, more than the annual emissions of many developing countries.
So, Eyjafjallajökull emits 300,000 over 4 days ie 1.2 million tonnes while grounded planes saved 1.3 million tonne - hey, a reduction. Now, if we could get a few more volcanic eruptions happening around the globe, we could get the Gores and Greens of our back.
For a more serious look at Volcanoes, see Andy's Rant :