But hang on NASA GISS have the mid 20thC essentially flat 😉
By Paul Homewood
http://onlinelibrary.wiley.com/doi/10.1002/2016GL071941/abstract#grl55550-supinfo-0001
A new study has found that Arctic sea ice increased as much between 1950 and 1975, as it has decreased since.
Since this conflicts with their unshakeable belief that GHGs are causing the Arctic to warm, they have had to concoct the nonsensical theory that the earlier increase was caused by aerosols.
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