Why architects need to use their ears

According to Julian Treasure, because of poor acoustics, students in classrooms miss 50 percent of what their teachers say and patients in hospitals have trouble sleeping because they continually feel stressed.

Watch the video below and leave your comments about this Ted Talk if you feel like it.

Is there any way to actually overcome in our schools the drawbacks he is pointing out?
 How does  acoustic pollution affect your learning? 
And your everyday life?