I agree it is a relatively small thing in terms of saving the planet but I can’t think of a less essential damaging thing we do than flying abroad for a holiday. It seems like the first thing everybody should be able to cut out of their lives, probably easier than cutting out meat, recycling, buying less plastic. Obviously it’s a different circumstance if you have family and loved ones you need to see that don’t live in the same country. Likewise huge expensive golf courses that take up tonnes of land, mess up biodiversity and are only of use to the rich, why do they exist? There’s probably a hundred different sports that are less snobby, expensive and damaging but people like golf so tough etc