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A group of scientists in alaska notices that not only have atmospheric co2 levels increased at their sampling site but so too have methane levels. what most likely accounts for this increase in methane levels? none of the answer options is correct.the melting of permafrost accompanied by the thawing of methane-producing bacteria.a decrease in beef production near the researchers' sampling area.the failure of rice paddies to be established in alaska, given its climate.the release of methane from thawed permafrost.

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GeoPanther
The correct answer is - the release of methane from thawed permafrost.

In the past decade it has been noticed that the levels of methane are increasing in the atmosphere, and the biggest ''producer'' of this methane is the melting permafrost. There's huge amounts of methane trapped underground bellow the permafrost. But the permafrost is melting because of the global worming, so the methane is free to come out and go up in the atmosphere. 

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