By now, most of us know that we should be trying to fly less. Travelling by aeroplane accounts for 2% of total global greenhouse gas emissions, and those 39.4 million annual flights pump out toxic nitrogen oxide, cancer-causing exhaust particulates and carbon dioxide; the latter of which absorbs heat and re-emits it back to earth.  

But for most people – with beloved friends and family often spread across the globe – completely quitting on flying is unlikely to be an option. So what can we do to reduce the impact of our aviation travel?