Kind of convenient that the early industrial age did not contribute to global cooling in the 30's and 40's. Cherry-picking data, typical of IPCC tactics.
Most analyses attribute some of the cooling to sulfur aerosols from the war and post-war industrialization (into the 70s, when the Clean Air Act started to kick in). Remember that the 1930s was a hot decade (Dust Bowl!) and the slight mid-century cooling commenced at the end of the 1930s.