The Real Global Warming Signal

Foster & Rahmstorf compare five different 30 year global temperature records and use a regression to remove most of the effect three big interfering variables: the el Nino southern oscillation, atmospheric aerosols (mostly from volcanic eruptions), and variations in solar energy received by the earth.  The temperature records use different source data sets and measure somewhat different things, eg, surface v lower atmosphere temperature.

The result:

http://tamino.wordpress.com/2011/12/06/the-real-global-warming-signal/