Strangely enough, the temperature record is SO reliable that a new study is underway to address current denials, er, criticisms.
http://www.berkeleyearth.org/study
The project has the following goals:
1) To merge existing surface station temperature data sets into a new comprehensive raw data set with a common format that could be used for weather and climate research
2) To review existing temperature processing algorithms for averaging, genization, and error analysis to understand both their advantages and their limitations
3) To develop new approaches and alternative statistical methods that may be able to effectively remove some of the limitations present in existing algorithms
4) To create and publish a new global surface temperature record and associated uncertainty analysis
5) To provide an open platform for further analysis by publishing our complete data and software code as well as tools to aid both professional and amateur exploration of the data
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The science has already been settled, so why this?