Under the patronage of Prince Faisal bin Salman bin Abdulaziz, Governor of Madinah Region, mayor of Madinah region Dr. Khalid bin Abdel Qader Taher inaugurated here on Tuesday evening the Fifth international conference "cities environment" which is organized by Madinah Municipality, the City of King Abdullah Atomic Energy, Dubai, the University of Taibah and Environmental Center for Arab Towns with support of the Arab Towns Organization. Speeches during the inauguration focused on the theme of the conference, turning waste into energy.