From The @Guardian: The first active leak of methane from the sea floor in Antarctica has been revealed by scientists. They also found that microbes that normally consume the gas before it reaches the atmosphere had only arrived in small numbers after five years, allowing the gas to escape. The release of methane from frozen underwater stores is one of the key tipping points that scientists are concerned about, which occur when a particular impact of global heating becomes unstoppable. Follow the link in their bio to read more about why the methane cycle is such a cause for concern.