Ok, now their R script is crashing on a file not found.

The best HadCRUT temperature data file to use is [here](http://www.cru.uea.ac.uk/cru/data/temperature/HadCRUT4-gl.dat).

The format is a bit strange. Even-numbered lines contain areal coverage (i.e. what fraction of the globe is covered by the data set) and can be ignored here. Odd-numbered lines contain the temperature data: the first column is year, the next twelve columns are the monthly temperature anomalies, and the last column is the annual average temperature anomaly. Missing values are, annoyingly, coded as 0.000 (which could be confused with a true zero temperature anomaly).