evidence: They’re at a record level." [...] The Arctic set a https://www.nasa.gov/feature/goddard/2017/sea-ice-extent-sinks-to-record-lows-at-both-poles record for the lowest amount of sea ice in the winter, when sea ice usually grows to its maximum levels, in March 2017. In 2012, the Arctic set a record for lowest sea ice levels. Sea ice recovered slightly from that record and in 2017 in September, the annual low was only the eighth lowest on record, according to the National Snow and Ice Data Center. But the 10 lowest years of sea ice have been all in the last 11 years. Arctic sea ice is declining at a rate of 13.2 percent per decade, according to NASA. [...] "Both of the large ice sheets of Greenland and Antarctica are losing hundreds of billions of tons of ice per year. Sea ice continues to decline significantly in the Arctic decade by decade, and the thickness of Arctic ice is now less than 50 percent of what it was 40 years ago," National Snow and Ice Data Center scientist Ted Scambos said in an email.