I love an untapped resource (as opposed to a very overstressed one). The responsible travel movement is perfect. It takes the huge global travel industry (1.2 billion people holidaying abroad in 2015) and shapes it into a force for good, rather than one that trashes local host communities, siphoning profits to rich countries. It’s untapped partly because we’re encouraged to think like travel consumers (obsessed with injustices such as single-person supplements) and not as citizens