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* The fifth IPCC report (2013) states that challenges persist in reconstructing temperatures before the time of the instrumental record due to limitations of spatial sampling, uncertainties in individual proxy records and challenges associated with the statistical methods used to calibrate and integrate multi-proxy information.

Hopefully it will give some insight into the science and the people behind it.[129] [130] Look at the instrumental record!

There are huge differences between different regions - Alaska has warmed substantially while eastern North America cooled after the 1950s.

As of July 2015, no similar study has been conducted on a global basis.[81] * From 1979–2014, the three temperate datasets posted above differed from one another by an annual average of 0.13ºF (0.07ºC).

The largest gap between any of the datasets in any year was 0.38ºF (0.21ºC), and the smallest gap was 0ºF/C: * To reconstruct global average temperatures in the era before instrumental measurements were made on a global scale, scientists use proxies that respond to changes in climate, such as the widths of tree rings and certain elements of the geological record, to estimate temperature variations in the past.[83] [84] * The Intergovernmental Panel on Climate Change (IPCC) is a scientific body established in 1988 by the United Nations and World Meteorological Organization.

The report states that some of the global warming since 1850 could be a recovery from the Little Ice Age rather than a direct result of human activities.

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