temperatures as what s called a heat dome is causing the dangerous conditions to expand. in south eastern europe temperatures of a0 degrees celsius have caused power cuts in tourist hotspots like croatia, impacting all sorts such as traffic lights failing. and as you ve just been hearing, in saudi arabia at least 1,301 people died during this year s hajj pilgrimage to mecca the most devastating example of the impact of extreme heat. no surprise, then, that this is changing the way we choose to travel something that is particularly important for those countries who rely on tourism to support their economies. joining me now is andrew holden professor of environment and tourism at goldsmiths university of london. good morning to you. no good morning. so this issue of extreme heat is not new to us. we saw last summer many parts of europe experiencing very high temperatures, wildfires impacting tourism. to what extent are we changing our choices when it comes to where we h