Officials in central China have ruled out a natural gas leak, with inspectors suspecting a sewer gas explosion instead.
A scientist studying the crater in the remote Yamal peninsula also said it has just a few years to "live."
The crater is believed to have formed through an explosion after a build-up of methane underground.
Studies show emissions have risen by almost 10 percent in the last 20 years.
Researchers had previously found evidence of over 100 craters lining the floor of the Barents Sea.
Scientists from Denmark were studying a king penguin colony to assess its impact on greenhouse gas emissions.
Bacteria that consume methane were found to burrow into the worms' skin, allowing them to get nutrients from the greenhouse gas.
Researchers found these regions of the eastern Arctic Ocean are relatively rare, which is "good news" for the climate.
The next decades, partly as a result of our inaction over the past ones, are crucial to mitigate climate warming. It is time to embrace innovative and proactive new experiments.
A method of extracting methane recently described in Scientific Reports could turn permafrost hydrate reservoirs into carbon sinks.
The leak emitted more of the gas in 20 days than the oil and gas industries of some European nations do in a year.
Wetlands are the biggest natural source of methane in the world.
Scientists used buckets to scoop out methane bubbles from a spot in the Arctic sea.
Workers and residents near fracking sites in Colorado are exposed to toxic chemicals says a Colorado study.
The researchers were able to scoop the bubbling water out of the sea with buckets.
The 'abiotic' methane may hold clues about its presence elsewhere in the solar system, researchers say.
"The commercialization of shale gas and oil in the 21st century has dramatically increased global methane emissions", said the scientist behind the study.
Scientists have identified genetically inherited gut microbes that regulate how much methane a cow produces.
If growth continues, it could negate or reverse any gains made by reducing carbon dioxide emissions.
"The technology has major environmental ramifications and has the potential to alter the economic and political landscape in many U.S. states."
Four million people living in the Arctic permafrost area will be affected by damage to infrastructure.
The permafrost beneath certain lakes is thawing rapidly, which will release a significant amount of methane into the atmosphere.
Georgian Prime Minister Mamuka Bakhtadze declared a day of mourning and said it was time the government stopped putting its citizens' lives at risk.
The rover has discovered ancient organic material that may be biological in origin, although this has not yet been proven.
If the Arctic permafrost melts, greenhouse gasses equivalent to burning all of the world's forests two-and-a-half times over could be released.
Enceladus is a "hot spot" in the search for extraterrestrial life.
The bacteria, found in a subglacial lake, could be helping to limit the emission of methane into the atmosphere.