**1. Introduction**

Negative effects of human activities to the environment are visible almost on the entire planet.

The tourism sector accounts for an increasingly large share of the global economy. Growth of tourism makes the destination, as the basic resource, more vulnerable. The share of tourism sector's energy consumption is growing significantly on a daily basis. The analyses of global tourism growth indicate increasing growth of urban tourism.

A massive influx of tourists into the cities poses considerable challenges, including the preservation of cultural resources and the built environment, the sustainability of social interaction between local citizens and tourists, waste management, increased energy consumption and other.
