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I know it's not the central point of the article, but this article is severely misleading to the extent that it suggests that CO2 kills only by displacing oxygen, or that it isn't "pungent". While small amounts of CO2 are nontoxic and indeed necessary (without it you forget to breathe), high concentrations are very toxic, and will kill you very very dead even if there's plenty of oxygen left. See the carbon dioxide article for more quantitative statements.
As for "pungency", take a whiff over a bowl of punch with dry ice in it and tell me what you think. It may be true that you don't detect the CO2 strictly speaking by way of the olfactory sense, but you'll definitely know it's there.
But the more serious error is the one about toxicity, as that could cause people to underestimate the danger. --Trovatore (talk) 08:18, 4 April 2010 (UTC)
The origin of mazukus and their association with Lake Kivu is misleading. Lake Kivu has some 300 billion cubic metres of carbon dioxide dissolved, mainly in deeper water below 260m. The origin of this lake's gas is partially from biogenic processes and partially volcanic. On the north shore of Lake Kivu the lava beds associated with Mt Nyiragongo and Mt Nyamulagira, both active volcanoes, lie hundreds of metres deep in a series of lava flows dating back 10 000 years. Gases from the volcano, including carbon dioxide and some sulphur dioxide, also difuse their way through the lava beds. Rainwater falling on the lava plains drains through the lava beds, picking up some of the diffusing carbon dioxide and carrying into the lake through underground streams.
However some of the carbon dioxide diffuses right up through the surface of the lava beds and is swept away by the wind. On a still night, this diffusing gas is not swept away, but accumulates in hollows, trenches, cellars and gullies. An unsuspecting person, it has happened to people falling drunk into ditches or even hiding from someone, spends more than a few minutes in such a pocket of gas and they will quickly lose consciousness and die. The mazuku is therefore associated with the lava beds near live volcanoes, not the lake. George Nowak (talk) 15:12, 6 April 2010 (UTC)