Climate scientists face harassment, threats and fears of 'McCarthyist attacks'

Researchers will have to deal with attacks from a range of powerful foes in the coming years – and for many, it has already startedA little less than seven years ago, the climate scientist Michael Mann ambled into his office at Penn State University with a wedge of mail tucked under his arm. As he tore into one of the envelopes, which was hand-addressed to him, white powder tumbled from the folds of the letter. Mann recoiled from the grainy plume and rushed to the bathroom to scrub his han