text: Limited car usage reduces greenhouse gas emission, increases the safety of the people, relieves stress and promotes exercise. Select places have put the idea of a cleaner and more efficient planet in motion, in which the others should follow suit.    The use of the technolpgy to read the emotions of students in the classroom can be very useful. The use of this technology can help improve and better the lessons that the teachers give. Also this could help the teachers detect and solve emotinal problems that the students may have.