Limnic eruption
…in Cameroon at Lake Monoun in 1984, causing asphyxiation and death of 37 people living nearby. A second, deadlier eruption happened at neighboring Lake Nyos in 1986, releasing over 80 million m3 of CO2, killing around 1,700 people and 3,000 livestock, again by asphyxiation. A third lake, the much larger…