Possibly the most authoritative individual on climate change is Dr. Richard Lindzen, the Alfred P. Sloan Professor of Atmospheric Sciences at MIT.
Here is a paragraph from an op/ed he wrote for the Wall Street Journal a few days ago. The link to the entire column is here.
“Claims that climate change is accelerating are bizarre. There is general support for the assertion that GATA has increased about 1.5 degrees Fahrenheit since the middle of the 19th century. The quality of the data is poor, though, and because the changes are small, it is easy to nudge such data a few tenths of a degree in any direction. Several of the emails from the University of East Anglia’s Climate Research Unit (CRU) that have caused such a public ruckus dealt with how to do this so as to maximize apparent changes.”