From the comments at WattsUpwithThat

Unbelievable!

In the Greenhouse Gas Endangerment Finding, Response to Comment 2-111, EPA says this (Volume 2 of Responses to comments available here: http://www.epa.gov/climatechange/endangerment.html)
In the April version of the TSD, EPA stated: “Antarctic sea ice extent shows no statistically significant average trends according to IPCC (2007d). However, the U.S. National and Snow and Ice Data Center [NSIDC] states that Antarctic sea ice underwent a slight increase from 1979 to 2007 (NSIDC, 2009).” EPA acknowledges these two sentences, taken together, may confuse the reader. And we are also aware of updated data from NSIDC. So we have revised the TSD to provide more clarity. It now reads: “For the period 1979––2008, Antarctic sea ice underwent a not statistically significant increase of 0.9% (about 100,000 km^2; 42,000 mi^2) per decade (NSIDC, 2009).”