From Skeptical Science, licensed under creative commons attribution.
This graphic illustrates the way some climate deniers would have you look at the evidence about climate.
Their technique: choose a period of time within which there is a decline or leveling off of apparent warming–since climate graphs are always jagged lines these periods of time are easy to find in a complex record–then declare that warming has stopped. The blue lines above represent such periods, the latest one beginning in 1998. (Perhaps you’ve encountered that one.)
The purpose of such arguments is to distract people from the continuing long-term warming trend, which, as the red line makes apparent, has continued all along, unabated.