Gee, Kevin, it’s been warming since about 1650.
Warmist Kevin Trenberth uses the graph below to support his argument that the planet is warming in steps, with wiggles in between.
But of course, the warming started long before 1970… say about 1650, as this graph from the IPCC’s first assessment shows.
Pay no attention to the steps and wiggles… look at the warming behind the curtain.