Hiding The Decline : The Man-Made Hockey Stick

USHCN needs to hide the decline in summer temperatures, so they cheat by adding 1.4 degrees  on to recent temperatures relative to 100 years ago.  Then they blame the fake temperature rise on CO2.

Purely coincidentally, USHCN is as part of the Carbon Dioxide Information and Analysis Center at Oak Ridge National Laboratory. No confirmation bias there.