Modern Ethics and Gleick

Scientific American has an opinion piece online which they have titled: "Should Global-Warming Activists Lie to Defend Their Cause?"

The author, a teacher of humanities, brings the ethical philosophies of Kant and Mill to bear on the Gleick/Heartland incident, and comes to this nuanced position:

Even if Gleick’s lie was morally right, it was strategically wrong.

When first he lied,
he was justified,
but he hadn't of ought,
once he got caught.