Planes or volcano?

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All the huff and puff about the volcanic eruption in Iceland had me wondering about what was the worst GHG contributor: volcanic ash or the air traffic over the North Atlantic and Northern Europe? And wouldn’t you know it, these guys had an answer for me.

They have a nifty diagram too:

UPDATE: It’s also quite fun to read the comments debating the cooling effects of the ash vs. the impact of runaway greenhouses prior to the eruption vs. the impact of the Brits’ breathing habits. Gotta love climate science…