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United Nations - Global mean surface temperatures
So, what has this carbon dioxide increase done to global temperatures? I recall that ten years ago, the experts thought it quite uncertain that global temperature was indeed increasing. They would know in ten years. I vowed not to look at it for ten years at the time, as the arguments pro and con were very tiresome.

The plots show an increase of about 0.2 degrees C per decade in the last 25 years. The United Nations experts are becoming more positive there is actually an increase due to human intervention each time they review the evidence. Source: http://www.ipcc.ch/press/cop7/part1.ppt

IPCC Presentation to COP - 7