The logical relationship between clauses establishes different notions.
An example which expresses the notion of concession is indicated in:
(A) since public understanding is harder to change than terminology, (¢. 7-8)
(B) If this new term was intended to be clear, (¢. 29)
(C) because so much political speech involves defending the indefensible, (¢. 30-31)
(D) This, though, isn't clear when it is simply labelled “clean coal”. (¢. 36-37)