"When future generations look back on the global-warming scare of the past 30 years, nothing will shock them more than the extent to which the official temperature records – on which the entire panic ultimately rested – were systematically “adjusted†to show the Earth as having warmed much more than the actual data justified."
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Source : "The fiddling with temperature data is the biggest science scandal ever". www.telegraph.co.uk. February 7, 2015.