I stumbled on this superb graphic (via the comments here) and, although its way off topic for this blog, couldn't resist linking to it.
The first thing you see is the overall trend in global temperature change over the last 40(ish) years. The second is how climate change 'sceptics' might prefer to present the picture: by breaking the period into smaller chunks you can show that over any given 5-10 year period temperatures were either flat or actually fell.
The real action comes at the end of the chart, since it is a standard climate-change denier line that temperatures haven't risen since 1998, the warmest year on record. The overall trend is clearly upwards - selecting 1998 as a start year in order to demonstrate a decline is a classic an example of 'cherry-picking' data to suit one's argument (see here for a discussion).
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