The effects of global warming and climate changes are of
relevant concern for environment and human activities in the
Mediterranean area. The average air temperature rise of 2 ◦C represents
a critical limit beyond which dangerous climate changes
should occur by 2030 [1]. More than 90 million people live in the
twenty most populated Mediterranean metropolitan areas; according
to the actual trend other 70 million of people are expected to
move to leave the countryside towards the urban area by 2025
[2]. The global warming and the urban sprawl causes a number
of environmental hazards, the urban heat island (UHI) is one of
these.