Multiple historical instrumental records and reconstructions demonstrate that Earth's climate has undergone discernible warming trends over the past century.
The claim is specific and empirical, dealing with evidence of Earth's warming climate. The retrieved papers provide historical instrumental and statistical temperature reconstructions showing warming trends (e.g., Early Twentieth Century Warming), supporting the consensus that multiple lines of evidence demonstrate climate warming. None of the papers refute the overall warming trend; some discuss proxy adjustments or regional variations, but overall the evidence consistently supports long-term temperature changes.