It's the hot global trend in travel that counts Prince Harry and young climate activist Greta Thunberg as its flag-bearers, but for a country that is a long, carbon-emitting flight from anywhere, how does the sustainable tourism bug translate down under?

In a big way, it turns out. Research released by Nielsen this year showed that more than 2.2 million Australians wanted to take part in eco-tourism on their holidays within the next year.