The GISS Land-Ocean index is a little over ten years old. Before that, they were honest enough to admit they didn’t have enough ocean data prior to 1950 to even attempt the index.
Since 2005, Gavin Schmidt has increased 1910 to 2004 warming by nearly 40%, through a series of data tamperings cooling the past and warming the present.
Their land only temperature record has been tampered with for decades, and now shows twice as much 1880-1980 warming as it did in 1981.
The surface temperature record is a complete fraud. It is managed by political hacks generating propaganda for the White House.