"I resign from APS," Giaever wrote.

Giaever was cooled to the statement on warming theory by a line claiming that "the evidence is incontrovertible."

"In the APS it is ok to discuss whether the mass of the proton changes over time and how a multi-universe behaves, but the evidence of global warming is incontrovertible?" he wrote in an email to Kate Kirby, executive officer of the physics society.

"The claim … is that the temperature has changed from ~288.0 to ~288.8 degree Kelvin in about 150 years, which (if true) means to me is that the temperature has been amazingly stable, and both human health and happiness have definitely improved in this 'warming' period," his email message said.