Summary:

- Swamp gas, also known as methane, is a natural gas that is produced when organic matter decomposes in wetlands and other damp environments.

- The ignition of swamp gas can create a mysterious glowing light called a "will-o'-the-wisp" or "ignis fatuus," which was once thought to be a supernatural phenomenon but is actually caused by the chemical reaction of the methane gas burning.

- Swamp gas and the will-o'-the-wisp are important parts of the natural carbon cycle, as the methane gas helps to release nutrients back into the ecosystem, but they can also be dangerous if the gas builds up in enclosed spaces.