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Story summary
- U.S. scientists report thawing Alaskan permafrost releases methane and carbon dioxide, intensifying global warming.
- Emissions could raise temperatures by roughly 0.25 °C by 2100, adding about 20 % to century-end warming.
- Satellites have mapped over 40,000 Arctic ground slumps, including a 10-foot crater on Alaska’s North Slope.
- Acidic seeps in the Brooks Range show pH 3.2 and metal concentrations, with 2019-2020 spikes raising sulfate 263 % and zinc 770 %.
