I have never bought into the idea that we can teach or study academic English, or business English or any other kind of English as a special subject. English is English.
If we are interested in a subject, we will read on it, listen to audio content about it, perhaps even talk about it and write about it, and in this way we will acquire the vocabulary and turns of phrase that we need. We will acquire these skills incidentally, as we pursue a subject of interest. As Krahen says “students acquire an enormous amount of academic language through extensive reading, probably the most powerful tool for reaching advanced levels of English competence.”
Read the original education expert’s article on the Education Week blog and then read Stephen Krashen’s common sense rebuttal in the comments section.