Figure TS.13. (a) Arctic minimum sea ice extent; (b) arctic sea ice extent anomalies; and (c) antarctic sea ice extent anomalies all for the period 1979 to 2005. Symbols indicate annual values while the smooth blue curves show decadal variations (see Appendix 3.A). The dashed lines indicate the linear trends. (a) Results show a linear trend of –60 ± 20 x 10³ km² yr^–1, or approximately -7.4% per decade. (b) The linear trend is –33 ± 7.4 x 10³ km² yr^–1 (equivalent to approximately –2.7% per decade) and is significant at the 95% confidence level. (c) Antarctic results show a small positive trend of 5.6 ± 9.2 x 10³ km² yr^–1, which is not statistically significant. {Figures 4.8 and 4.9}