Arctic sea ice is at its lowest in September, when the ice stops melting and glaciers begin to accumulate again. The National Snow and Ice Data Center tracks ice and says the extent of sea ice this year is expected to be one of the lowest in the satellite record. Climate watchers in Seattle and Amsterdam are bringing attention to the issue by targeting cruise ships that burn heavy fuel oil, a practice amplifying the effects of climate change. Martha Baskin has our story.
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