Air travel for example, causes atmospheric pollution by definition and hotels, particularly those in remote locations, place a significant burden on infrastructural facilities such as sewage and waste treatment and water and electricity supply. Simultaneously, tourism is affected by climate change: the choice of destinations is often dependent on the expected climate and many tourist activities such as skiing, trekking or surfing are climate-driven. Some predict that with global warming becoming a reality, there will be a shift in preference from the lower latitudes with warmer climates to the higher latitudes and cooler climates.