“If [danger] ever reach us it must spring up amongst us; it cannot come from abroad. If destruction be our lot we must ourselves be its author and finisher. As a nation of freemen we must live through all time or die by suicide.” --Abraham Lincoln

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Problems with temperature data include a lack of geographically and historically representative data, contamination of the records by heat from urban areas, and corruption of the data introduced by a process known as “homogenization.”