Travel and tourism accounts for 10.2 percent of the world’s GDP. That’s the equivalent of 7.6 trillion dollars, and one in every ten jobs on the planet is related to the tourism industry. So it’s easy to understand why every nation wants a piece of the pie—especially when those numbers are expected to continue to grow. But what happens when it becomes too much of a good thing? In this segment from season four of The Travel Detective, Peter Greenberg explores the growing problem of overtourism.