We are all familiar with this NASA graph, which forms the basis of the hockey stick. It shows about 1.2C warming from 1880 to 1998.
But their graphs didn’t always look like this. In 1999 they showed no net warming from the 1870’s to the 1970’s, and a total of 0.5C warming from the 1870’s to 1998. NASA has more than doubled hockey stick warming since 1999. Clever of them to not show warm pre-1880 temperatures in their current graph.