Daily News 06/28
Daily News 06/28
Methane is the second most abundant anthropogenic GHG after carbon dioxide (CO2), accounting for about 11 percent of global emissions. Methane is more than 28 times as potent as carbon dioxide at trapping heat in the atmosphere. Over the last two centuries, methane concentrations in the atmosphere have more than doubled, largely due to human-related activities. Because methane is both a powerful greenhouse gas and short-lived compared to carbon dioxide, achieving significant reductions would have a rapid and significant effect on atmospheric warming potential. — Importance of Methane
The levels of methane in the groundwater springs we measured appeared to be connected to the type of geology that the water emerges from. We found that the waters with the highest concentrations had flowed through underground layers of shale rock. The shale on Svalbard was formed up to 160 million years ago from mud at the bottom of a shallow sea that was compressed into rocks. Lots of organic material, such as plant life and small marine organisms, was compacted into these layers of rocks as they formed. Over time, under high pressure and temperatures, this material turns into fossil fuels, like methane. This means the methane that’s being flushed out of the rocks and brought to the surface by the groundwater now may be ancient gas that’s been sequestered for millions of years. This is concerning because we know there are large reservoirs of fossil fuels, including methane, stored deep within the rocks in many regions of the Arctic. Therefore, we should expect that this phenomenon is widespread, and that methane is seeping out in front of retreating glaciers across the Arctic. Moreover, as glaciers continue to melt at an accelerating pace, we believe methane emissions from shale rock will amplify. Melting glaciers and thawing permafrost are uncovering pathways for ancient methane gas to be unearthed—a feedback loop caused by climate change. These methane emissions are out of our direct control: once this release mechanism has been triggered, we can neither stop it nor reverse it.— Melting glaciers and methane emissions
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