Mass tourism is becoming a problem countries as more travellers flock to tourist destinations. In 2017, 1.3 billion people travelled to a foreign country and international tourism expenditure was $US1.362 trillion in 2016, according to the World Bank.

The impact of this is being felt by countries both small and large. For example, Spain is actively limiting the number of tourists in Barcelona by restricting accommodation in the city, while Thailand has indefinitely closed Maya Bay on Ko Phi Phi Leh island, which was made famous by the 2000 film The Beach, starring Leonardo Di Caprio. It is believed that 80% of the beach's coral was damaged by the onslaught of tourists.

Also under attack by tourists is the western Pacific Ocean country of Palau. The 13th smallest country in the world with a population of just 20,000 people, Palau is a popular travel destination for Japanese, Chinese and South Korean tourists.

In recent years, the issue for Palau has got worse. Some tourists mistreated the natural beauty by touching wildlife, feeding the fish, stepping on the coral and littering the oceans. There was even anecdotal evidence of jellyfish being taken back to China.