The most important indicator of global warming, by far, is the land and sea surface temperature record. This has been criticized to date in several ways, including the choice of stations and the methods for correcting systematic errors.
Initiated and sponsored by Novim, the Berkeley Earth Surface Temperature study set out to to do a new reconciliation of the global surface temperature record in a highly rigorous manner.
Beginning with land surface records dating from 1800, the project team has used over 39,000 unique stations, more than five times the 7,280 stations found in the Global Historical Climatology Network Monthly data set (GHCN-M) that has served as the focus of many climate studies to date.
Novim's goal has been to resolve current criticism of former temperature analyses, and to prepare an open record that will be available to researchers and the public at large. The results include not only a comprehensive normalization of the historical data, but estimates of uncertainties in the record, the complete raw and normalized data bases and all of the algorithms and techniques used by the team.
From the beginning, Novim's sole directive has been to compile the most complete and accurate record of the earth's temperature going back to the very first historical data. It has never been our intent to draw conclusions from this data. Members of the scientific community, including members of the BEST project, as well as the general public are encouraged to make use of this new digital tool.
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Economist summary of the surface temperature study