One interesting sidebit: while I know carbon sequestration had the potential to leak CO2 and threaten life, I didn't realize it had already once happened:
In 1986, at Lake Nyos in Cameroon, 300,000 tons of naturally occurring carbon dioxide that had been trapped in the lake suddenly rose to the surface and formed a misty cloud, suffocating 1,700 people.
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After the big disaster in Nyos people have been trying to siphon off CO2 so it doesn't repeat. (It is continously being added from volcanic activity below the lake). I saw a documentary and the pictures were dramatic. There were so much CO2 solved in the water at the bottom that as it rose and the pressure decreased it relaeased, if I recall correcly, 9 liters of CO2 for every liter of water.
Unfortunately the same lake also threatens to cause a more conventional disaster. It is locate high on a mountain and one side is a fairly thin, crumbling wall of rock that could collapse, causing a gigantic flooding in the area below.
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