The mystery deepens: Where did that decline go?

Jo Nova
"Frank Lansner has done some excellent follow-up on the missing “decline” in temperatures from 1940 to 1975, and things get even more interesting. Recall that the original “hide the decline” statement comes from the ClimateGate e-mails and refers to “hiding” the tree ring data that shows a decline in temperatures after 1960. It’s known as the “divergence problem” because tree rings diverge from the allegedly measured temperatures. But, Frank shows that the peer reviewed data supports the original graphs, and that real measured temperatures did decline from 1960 onwards…sharply. Yet, in the GISS version of that period, temperatures from the cold 1970’s were repeatedly “adjusted” years later, and progressively made warmer."

..Three decades of adjustments

When did the “funny business” begin? By 1980 Hansen and GISS had already produced graphs that were starting to neutralize the decline. His graphs of 1987 and 2007 further fudged the decline, until the cooling from 1960 to 1975 was completely lost."