Nobel prize winner for physics in 1973 Dr. Ivar Giaever resigned as a Fellow from the American Physical Society in disgust over the group’s promotion of man-made global warming fears.
http://www.climatedepot.com/2011/09/14/exclusive-nobel-prizewinning-physicist-who-endorsed-obama-dissents-resigns-from-american-physical-society-over-groups-promotion-of-manmade-global-warming/#ixzz3ofQCBBPS
Lennart Bengtsson Resigns from Global Warming Policy Foundation, citing McCarthyism
http://www.thegwpf.org/lennart-bengtsson-resigns-gwpf-voices-shock-and-concern-at-the-extent-of-intolerance-within-the-climate-science-community/
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Professor Emeritus of physics Hal Lewis of the University of
California at Santa Barbara resigns, saying global warming is a hoax
perpetrated by corrupt scientists“It is of course, the global warming scam, with the (literally) trillions of dollars driving it, that has corrupted so many scientists, and has carried APS before it like a rogue wave. It is the greatest and most successful pseudoscientific fraud I have seen in my long life as a physicist.”
http://iceagenow.info/2015/10/top-us-scientist-resigned-after-admitting-that-global-warming-was-a-big-scam/