The Forbes article doesn’t seem to match with the data for sea ice extent from the National Snow and Ice Data Center. They use as base line the average from 1981 to 2010, and they then list year-by-year anomalies per month, first for the Northern Hemisphere, then from the Southern Hemisphere, and then combined to give a global figure. The reduction in the Northern Hemisphere July figures is pretty significant: +8.05 in 1979 to –9.49 in 2015, with a general trend towards negative anomalies over the period. The Southern Hemisphere July figures show a slight increase, from +2.37 in 1979 to +3.77 in 2015. The global figures for July are +4.48 in 1979 to -1.15 in 2015 (-1.894% per decade). Each month has different figures, however, and the January global figures are rather closer, though the trend is still downwards (at -1.02% per decade). Overall the figures don’t support the Forbes article. (http://www.ncdc.noaa.gov/snow-and-ice/extent/).
The Forbes article doesn’t seem to match with the data for sea ice extent from the National Snow and Ice Data Center. They use as base line the average from 1981 to 2010, and they then list year-by-year anomalies per month, first for the Northern Hemisphere, then from the Southern Hemisphere, and then combined to give a global figure. The reduction in the Northern Hemisphere July figures is pretty significant: +8.05 in 1979 to –9.49 in 2015, with a general trend towards negative anomalies over the period. The Southern Hemisphere July figures show a slight increase, from +2.37 in 1979 to +3.77 in 2015. The global figures for July are +4.48 in 1979 to -1.15 in 2015 (-1.894% per decade). Each month has different figures, however, and the January global figures are rather closer, though the trend is still downwards (at -1.02% per decade). Overall the figures don’t support the Forbes article. (http://www.ncdc.noaa.gov/snow-and-ice/extent/).