Climate change today is a reality. It involves lot of problems, the toughest ones being the loss of biodiversity, the rise of sea levels and the increase of temperatures. But there are also other less known phenomena connected with the global warming. One of them is the urban heat island, which is induced by materials composing the urban environment and involves numerous cities across Europe. Cement retains heat, sewer systems carry water away quickly, impeding the cooling, and heat is trapped between surfaces because of the so-called canyon effect. Thus,