Here's the thing: ALL jets are bad for the environment. Generally, the larger the jet, the more harmful it is because it needs to burn more avgas. But that said, most large jets transport hundreds of people at a time, while a private jet transports just a few people, equating to a larger carbon footprint per person on board. While private jets may seem like the peak of fashion and class, in this day and age of climate change and Stop Oil protests, it might not be too long before private jet users are genuinely vilified.