Facebook 'Fact Checkers' Punish and Censor Debate on Climate Science

Steven Koonin is one of the country's top physicists. He worked for President Barack Obama, a Democrat, as Under Secretary for Science at the U.S. Department of Energy. Science Feedback, one of Facebook's "independent fact-checkers," is barring reviews about his book, "Unsettled: What Climate Science Tells Us, What It Doesn’t and Why It Matters," and classifying its content as false. 

"Mr. Koonin is no 'climate denier,' to use the concocted phrase used to shut down debate," The Wall Street Journal writes in a review of the book. "The word 'denier' is...