Known since ancient times, roofs deliberately covered with plants are currently growing in popularity in highly developed countries. The most intense research and technical experience gathering in green roofs takes place in Germany since the beginning of 80. in 20th century. In that country 25 million m2 of green roofs were installed between 2000 and 2001. Such development is the effect of the state policy. The municipalities of over 250 German cities and towns promote green roofs through various direct and indirect incentives. Many cities in other countries do the same, i.e. Linz in Austria, Basel in Switzerland, Ontario in Canada or also Beijing in China. In those places green roofs gradually become an important part of the urban cityscape. On the other hand in places where legal incentives do not exist green roofs are still rare. Some cities, eg. London, are now seeking to settle their own policies and regulations to promote green roofs in a way that would suit them best, i.e. best solve their specific problems. This tendency reveals that green roofs are treated as an efficient tool towards implementation of sustainable development in architecture.
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