Make a summary figure illustrating global temperature changes since the dinosaurs went extinct.
This is dated now. I put it online in response to http://www.realclimate.org/index.php/archives/2014/03/can-we-make-better-graphs-of-global-temperature-history/ in case it helps someone make a better version.
The idea is to put predicted future changes in global temperature in the context of known past changes, and to communicate that comparison as clearly as possible.
1) This has not been peer-reviewed - use with caution.
2) I have scaled all the observational data to a common unit of 'global temperature anomaly w.r.t. 1961-90'. To do such a scaling properly would be very difficult and I did not try - I chose arbitrary scaling factors. This means this graph is not quantitatively robust and should not be treated as evidence of anything.