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 could account for this increase in methane levels?

Question

Quizplus · Accepted Answer

The increase in both atmospheric CO₂ and methane levels suggests that the source of the methane is likely from a natural source rather than human activity. The melting of permafrost in Alaska can release large amounts of methane trapped beneath the surface, as it was formed by decomposing organic matter which can continue to decompose and release methane when exposed to warmer temperatures. Therefore, choice C, the release of methane from thawed permafrost, is the best option to account for the observed increase in methane levels.

A Group of Scientists in Alaska Notices That Not Only