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What’s happening in the far north cannot be explained simply by invoking natural variability, the report concludes.
Thanks to our influence on the climate through our emissions of greenhouse gases, we’re well beyond the range of natural changes to the Arctic climate system over a timescale of millennia.
The 85 scientists who published the peer-reviewed Arctic Report Card synthesized research from multiple sources.
The section devoted to comparing today’s observed climate shifts to changes that occurred in the past is based in part on paleoclimate research using what scientists call “proxy records.” These include tree-ring records, and chemical fingerprints locked within cores drilled from ice sheets, lake sediments, and the seafloor.
Tom Yulsman is Director of the Center for Environmental Journalism and a Professor of Journalism at the University of Colorado, Boulder.
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(Source: NASA GISTEMP)Ima Geo is a visual blog focusing on the intersection of imagery, imagination and Earth.