In English schools, geography has been infected by PC; it is now a means of promoting an environmentalist agenda:

Pupils are leaving secondary school knowing "everything about pollution but nothing about rivers or mountains", say researchers from Canterbury University.

Their study found that geography lessons are dominated by "environmental values and attitudes" and do not provide pupils with enough information to form their own views. The new "greenwash" approach is being promoted by the Government, exam boards and geographical associations, the study claims.

One exam board, Edexcel, is accused of making a virtue out of providing fewer facts to pupils, boasting that its new GCSE syllabus "contains the same core geography [as before] but in less depth".

The study gives warning that the emphasis in the classroom has shifted from knowledge to "environmentalism, sustainability and cultural tolerance".

It concludes: "Replacing knowledge with values means that the subject has become less academic, less rigorous, less demanding and less interesting."

Crucial point: one of the selling points of the PC curriculum is that it is a dumbed-down curriculum. All politics aside, teaching "proper" attitudes toward minimal, selectively edited material is a lot easier than than either teaching a subject in its full complexity or teaching students to think for themselves (to the extent that such an oxymoronic concept is possible). A teacher does not have to be a good teacher to impart PC values toward slanted "facts." Nor does a student have to be a good student to earn high grades: the PC classroom is one organized around the idea that "learning" is equivalent to telling the teacher what he or she wants to hear; what the teacher wants, in turn, is to hear students regurgitate what has been fed to them. In such a classroom, no expertise is required. Neither is thought. In a world where teachers come increasingly from the lower ranks of college students and where are often not trained in the subjects they teach, the PC curriculum is a godsend of a very pragmatic, if tragic kind.