University of Washington atmospheric scientist Cliff Mass has been called plenty of names, including climate “denier,” but it wasn’t until he came out against the state’s proposed carbon tax last month that he was accused of being a racist. Since then, Mr. Mass said he has been upbraided by the university’s diversity dean and subjected to a faculty “inquisition,” events that have stoked alarm about the threat posed by campus climate-change activism to academic freedom. “I’m really worried about the intolerance that has developed at the university,” Mr. Mass told The Washington Times. “It’s really a minority of graduate students...