Have a look at this graphic. From NASA, this is a clear and simple path toward refutation of another of the deniers/skeptics misleading truthiness. Yes, there are a few spots (and, almost literally, spots) in Antarctica that are cooling but those are (quite sadly) overwhelmed by the areas warming.
This map of the temperature trend is based on thermal infrared (heat) observations from National Oceanic and Atmospheric Administration (NOAA) satellite sensors. This image shows trends in skin temperatures—roughly the top millimeter of the land, sea ice, or sea surface, rather than air temperatures—and it shows the long-term change in yearly surface temperature between 1981 and 2007. Warming areas appear in shades of red, and cooling areas appear in shades of blue. One of the most dramatically warmed areas appears at the former location of the Larsen B Ice Shelf, which shattered in 2002. -- NASA
This image is further discussed here.