Agroup 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.