The biggest threats to heritage sites worldwide? War, urbanisation, tourism, climate change and lack of funding / Norwegian outdoor tourism campaign shelved over environmental fears / Spain's tourism industry is at major risk from climate change, study warns: These areas face losing the most holidaymakers / Tourism could lead to water restrictions / Locals fear Greece's wonder of nature risks turning into a monster of tourism / Tourism 'intrinsically susceptible' to climate shocks, political unrest, pandemic threat