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Million-Year-Old Plant Fossils Are a Greenland Ice Sheet Warning


Photo: Felipe Dana (AP)
Jars of dirt taken from a Cold War-era military caper and lost in a freezer for decades could hold crucial new information about climate change and sea level rise. A study published on Monday in Proceedings of the National Academy of Scientists says that plant fossils found in a sample of dirt collected from a mile beneath the ice in the mid-1960s suggest that the world’s pre-human climate was at one point warm enough to completely melt the Greenland ice sheet.
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The dirt researchers inspected is a sediment sample from the bottom of an ice core, retrieved by drilling down into the ice sheet that covers the majority of Greenland. It’s pretty hard to actually reach all the way down to bedrock when taking samples due to the incredible pressure from the ice, explained Drew Christ, the study’s lead author and a postdoctoral fellow at the University of Vermont. There are only a few expeditions that have actually gotten sediment from ....

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Seals Reveal Changes at Antarctica's Most Imperiled Glacier


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An elephant seals rest on the beach in Robert Island, in the South Shetland Islands archipelago, Antarctica.
Photo: Natacha Pisarenko (AP)
Meltwater from Antarctic glaciers is changing the makeup of the region’s oceans more than previously known, a new study finds. The measurements that made these findings possible were collected by an unusual group of researchers: seals.
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The study, published Friday in Communications: Earth and Environment, uses measurements of water temperature and salinity to show how glacial meltwater is changing the makeup of the ocean near the Pine Island Glacier, one of the fastest-retreating glaciers on the continent. The researchers found that the warmer, fresh meltwater was distributed in patches throughout the ocean, including portions rising near the surface. Those surface layers bring up iron and other nutrients to the top of the ocean, encouraging algae and other biomass to grow as well as keeping the ocean r ....

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