Actually, White House officials said this figure came from the Massachusetts Institute of Technology. Researchers from the Climate Interactive project, which collaborates with MIT, quickly refuted Trump's point.

In fact, the MIT research to which the president referred showed that the Paris Agreement could lower the expected temperature increase by 0.6 to 1.1 C.

The Trump administration essentially pulled one piece of data out of the study and removed all context before inserting it into a factually inaccurate and entirely different claim, said John Reilly, co-director of the Joint Program on the Science and Policy of Global Change at MIT and author of the study. He said his study showed Paris was an important agreement that could shave off an entire degree of warming, but that climate skeptics have tried to make a similar false claim in the past. He said that if anything, the study shows an argument for remaining in Paris.

(Scientific American)