The other things have been identified and quantified. The biggest one is the El Niño–Southern Oscillation (ENSO), which is an effect that fluctuates fairly unpredictably over multi-year time scales. See http://en.wikipedia.org/wiki/E... for pretty graphs. During La-Nina years, the extra heat is stored in deeper ocean waters, so on the surface it appears cooler. However, during El-Nino years, the stored heat rises again, and heats up the atmosphere.
Because the ENSO effect is oscillating around the mean, it only provides a temporary relief from CO2-caused warming. The long term trend is still rising.
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