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Story summary
- Arctic sea ice has tied last year's record low, according to the National Snow and Ice Data Center.
- This year’s maximum extent reached 5.52 million square miles, about 9% below the 1981–2010 average.
- Experts warn the Arctic could have its first ice-free summer day before the decade ends.
- The rapid decline is driven by climate change and greenhouse gas emissions from fossil fuels, signaling climate issues.
