NBC's Brian Williams claimed "[s]cientists can't say yet whether global warming is the culprit" for rapid Arctic ice melt, but author of study he cited disagrees

SUMMARY: On NBC's Nightly News, Brian Williams claimed that "[s]cientists can't say yet whether global warming is the culprit for the recent reported ice melt in the Arctic." However, the scientist who wrote the NASA study to which Williams was presumably referring said that the new data from satellite imaging illustrating "an abrupt shrinkage" in the Arctic sea ice show "the strongest evidence of global warming in the Arctic so far."

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