Ice cores are a unique climate archive. Thanks to a new method, greenhouse gas concentrations in 1.5 million year old ice can be measured even more accurately. Ice cores are a unique climate archive.
New research suggests that the Earth's solid inner core is softer and more dynamic than previously thought, changing ideas.
Bill Chelmowski, a boat operator with the U.S. Army Corps of Engineers, St. Paul District, talks about taking ice core measurements on Lake Pepin on Wednesday, Feb. 16, 2022.
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