More Skin Cancers Basal Cell Carcinoma Melanoma Actinic Cheilitis (Farmer's lip) Squamous Cell Carcinoma Skin Neoplasm
Effects on Biogeochemical Cycle • Changes in Tropospheric Composition and Air Quality • Effects on Climate
Shown here is the total ozone concentration over the South Pole on Sept. 14, 2011. The "hole" is designated as the area where the total ozone concentration is below 220 Dobson units (a measure of thickness) and shown in red.
On Sept. 21, 2005, sea ice extent dropped to 2.05 million sq. miles, the lowest extent yet recorded in the satellite record. Incorporating the 2005 minimum, with a projection for ice growth in the last few days of this September, brings the estimated decline in Arctic sea ice to 8.5 percent per decade.