It looks like president-elect Obama will name John P. Holdren as his science advisor. Holdren is a professor of environmental policy at Harvard and former president of the American Association for the Advancement of Science. As Ron Bailey points out, he has been an activist on the ecological left and no friend of free markets. Perhaps more striking is his activism well beyond his own academic specialty, arguing, for instance, that scientists have a responsibility to advance the cause of the elimination of all nuclear weapons and seeking controls on population growth. And he didn’t say all this in the...