Almost everyone believes that the earth has warmed over the last 80 years. The reason we believe that is because the same people who have been tampering with the US data set tell us that the planet has warmed over the last 80 years. Do we have any other reason to believe it?
We know that the planet warmed from 1910 to 1945. We know that the planet cooled from 1950 to 1975. We know that the planet warmed from 1975 to 1998. Beyond those pieces of information, the relative position of 2012 and 1940 is a mystery.
So stop drooling. That is what Hansen wants you to do.