In 1986, Lake Nyos in Cameroon, released a cloud of ${\mathrm{CO}}_2$ into the atmosphere in what is known as a limnic eruption. The event killed 1,700 people and 3,500 domestic animals. Engineers installed piping anchored to a raft (left) to artificially remove the gas from the lake to prevent similar disasters in the future. The self-driven fountain (right), which can reach a height of $45\mathrm{m}$ above the lake surface, dissipates the ${\mathrm{CO}}_2$. Both images: Bill Evans/U.S. Geological Survey.