Researchers: Frozen methane under the seabed is thawing as oceans warm, and things are worse than we thought

Buried beneath the oceans surrounding continents is a naturally occurring frozen form of methane and water. Sometimes dubbed "fire-ice" as you can literally set light to it, marine methane hydrate can melt as the climate warms, uncontrollably releasing methane—a potent greenhouse gas—into the ocean and possibly the atmosphere.