The AGW Cult corruption is easily proven as they tamper with past temperature data. In a saner world, these guys would be in jail.
In 1975, the National Academy of Sciences published the graph below – showing that the 1930s were very hot in the northern hemisphere, and that there had been a sharp cooling trend since 1940.
Neither of these facts fit Hansen’s theory, so he largely got rid of both.
Data.GISS: GISS Surface Temperature Analysis: Analysis Graphs and Plots
GISS has a link on their web page to the data.
Annual and five-year running mean temperature changes with the base period 1951-1980 for the northern (red) and southern (blue) hemispheres.
available is a table
Data.GISS: GISS Surface Temperature Analysis: Analysis Graphs and Plots
Their public data link is of course forbidden, in the spirit of transparency.
Fortunately I was able to find a link in the Internet archive from 2010.
The graph below plots Hansen’s Northern Hemisphere five year running mean from that data set…
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cosmoscon 
We also know that the situation is far worse than indicated by recent data and models (which are reviewed in the following paragraphs). We’ve known for more than a decade what happens when the planes stop flying: Because particulates were removed when airplanes were grounded, Earth warmed by more than 1 C in the three days following 11 September 2001 . In other words, Earth’s temperature is already about 2 C higher than the industrial-revolution baseline. And because of positive feedbacks, 2 C leads directly and rapidly to 6 C, acidification-induced death of the world’s oceans, and the near-term demise of Homo sapiens. We can’t live without life-filled oceans, home to the tiny organisms that generate half the planet’s oxygen while comprising the base of the global food chain (contrary to the common belief that Wal-Mart forms the base of the food chain). So much for the wisdom of the self-proclaimed wise ape.