Columbia University in the City of New York

In many countries for hundreds (if not thousands) of years of "green roofs" were the standard design, mainly thanks to the excellent insulating qualities of topsoil and turf. In cold climates of Iceland and Scandinavian sod roofs helped to retain heat in their homes, and in tropical countries such as Tanzania, kept cool in the buildings. In the Canadian province of Newfoundland and Nova Scotia is still possible to meet early copies of "green roofs", brought the Vikings and later – the French colonists. Up until the mid xx century. "Green roofs" were considered only as a local construction practices.

However, in 1960. concerns associated with deteriorating environmental conditions, as well as the rapid decline in the area of gardening in the large cities have revived interest in "green roofs, especially in Northern Europe. Was carried out a wide range of new technical studies, including study components, membranes, drainage systems, light fertile layers, as well as research on the acceptability of plants. A key motivation for this support were public benefits associated with a decrease in the volume of stormwater and improving water and air quality. As a result, created a sector of the construction industry and "green roofs" became an integral part contemporary urban landscape.

According to some sources, the U.S. and Canada lag behind Europe, at least ten years in terms of investment in infrastructure, "green roofs", as an option for solving many problems quality of life faced by the modern metropolis. In the early 1990's.

Open High School

Open high school emerges as an effort to provide school education to all those who for various reasons could not conclude the corresponding studies and encourage the subject to become self-taught, receiving counseling from teachers only in the event that the student does not understand some of stereotypes from teaching materials. Thus the use of didactic materials becomes the axis of that method of learning. Among the materials which the institution recommends: books. Handled like the basic preparation material for independent study through guides and exercises, and these books are available for the majority of materials study guides. If the subject does not have a specific book made by the same preparatory program open, it then resorts to other texts that are used in other programs but which are adapted by the Secretariat of public education.

Materials for which must be used these guides according to the website of the high school open in the Federal District are; principles of physics, physics I and II, principles of general chemistry, chemistry, biology, bioethics, Mexico history 20th century. Workbooks. As the name indicates it, used to reinforce the knowledge that are acquired throughout the course through exercises. Carnets are used to do exercises and are used for English materials and self-evaluation exercises writing workshop. They are made exercises that the student knows how is that going to be their final exams to aproar course, and discusses multiple choice exercises. The materials that carry these exercises are methodology of reading, workshop of writing, mathematics, methodology of learning, principles of chemistry, chemistry, principles from physics, biology and social and political texts. These teaching materials are presented to students as optional, in other words, that if you prefer better you can use one single either all at once, which is recommended by the institution since all of these will reinforce the knowledge acquired, in addition to consistently attending counseling to teach teachers to dispel the doubts that may arise to the person concerned. These materials are readily available in libraries or you if you visit the portal high school opened in line come several directions in which we can find these materials without any complications.

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