Tag Archives: Methane

Climate Sense: Concerns rise over methane and auto-emission rules

Methane is a powerful greenhouse gas, capable of trapping far more heat than the same amount carbon dioxide, at least in the short term. This week, I point you to some new studies regarding the release of methane and news about a potential showdown between state and federal governments over fuel-economy standards.

Methane, the primary component of natural gas, is not well understood by many people. Methane can absorb more than 100 times as much energy as an equal weight of carbon dioxide, experts say, but methane breaks down in the atmosphere over time, so the effect of releasing a ton of methane actually decreases as time goes on.

Graphic: Environmental Protection Agency

Methane’s “global warming potential,” or GWP, is said to be 28-36 times higher than CO2 when considering the effects over 100 years — so methane is regarded as a major contributor to climate change. Check out the explanation of GWP by the Environmental Protection Agency.

Sources of methane are widespread — from vegetation naturally decomposing in wetlands to incidental releases during natural gas production and transport. Figuring out the amount of methane coming from various sources has been a puzzle for climate scientists.

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