Many scientists and philosophers were Muslims participated in debates humanistic and rational character. As a result, most Islamic writings of this period manifests a deeply liberal and secular character. The religious freedom of thought, although the company was controlled by Islamic values, allows for collaboration between Muslims, Christians and Hebrew, which leads to the development of philosophical creativity characteristic of the medieval Islamic period of centuries VIII and XIII.
The work of Al-Kindi, al-Laugh, Avicenna, Abd al-Latif and others when the first environmental studies. Treated subjects as water, air, soil, household waste in large cities and their negative impact on nature. Córdoba, Spain, Al-Andalus are equipped with garbage collection and storage containers.
Source : http://ro.wikipedia.org/wiki/Epoca_de_aur_a_islamului