Mark Carter has been researching aviation’s contribution to global warming for the last 6 years and helped set up both Flight Free Australia — http://www.flightfree.net.au — (a group campaigning to raise awareness of flying’s warming impact, with a ‘pledge to not fly’ call to action) and the No 3rd Tulla Runway coalition — http://www.no3rdtullarunway.net.au — campaigning agains the proposed third runway at Melbourne Airport. In 2018 I researched and wrote The elephant in the sky: the hazards of aviation emissions and how we can avoid them (https://flightfree.net.au/wp-content/uploads/2022/07/The-elephant-in-the-sky_online_s.pdf)