Back in the days when data manipulation was still strictly forbidden, scientists reported the globe cooled significantly for decades even as CO₂ concentrations increased.
The global cooling amplitude was -0.5°C from 1960-1965, and 1976 was reported to be the coldest year of any year measured since 1958 (Angell and Korshover, 1978).
Image Source: Angell and Korshover, 1978
The Northern Hemisphere cooling trend reached an amplitude of -0.6°C from 1958 to 1963 according to 150,000 to 200,000 measurements per month for 92% of the atmosphere (Starr and Oort, 1973).
Image Source: Starr and Oort, 1973
Today these recorded 1960-1965 and 1958-1963 cooling trends have been fully erased and replaced with a slight warming or pause.