Here's an excerpt from a BBC news report:
Scientists drilling ocean sediments off Canada have discovered methane ices at much shallower depths than expected.
"The rate of increase in the Earth's atmosphere for methane is much faster than that for carbon dioxide," said Timothy Collett, the co-chief scientist of the Integrated Ocean Drilling Program (IODP).
"Methane is 20 times more effective as a greenhouse gas than CO2. The source of this methane is uncertain, but there are a number of scientists who have looked at gas hydrates as contributing to this recent change."
Read the rest of the story at the BBC News.
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