The mean temperature in Europe is estimated to increase by 2-6°C by 2100, which will probably result in shorter and milder winters and warmer and longer summers. Several researchers believe that this will have a very great effect on tourist movements in Europe, turning them round from South to North. In other words, a climate change is expected to be favourable for summer and winter tourism in northern Europe and unfavourable for winter tourism in the Alps and summer tourism around the Mediterranean. However, it is not yet known what economic, social and environmental consequences this change in tourism will have in Europe.

The aim of this article is to make the reader understand the complexity of the goods and services systems provided by tour operators, because these are the main providers for the activities included in the tourism sector.

The article is structure in many parts: theoretical approaches, research methodology and the results of its application, conclusions. The main research method was the case study on a large Romanian tour operator