FIFA and pop superstars should discount tickets for fans to keep climate costs of 'mega-events' down, say researchers‎

The vast majority of carbon emissions caused by "mega-events" such as World Cups and global concert tours come from audience travel, according to University of Cambridge researchers. In a new study, researchers estimate that expanding to 48 teams for this year's World Cup increased emissions by well over half a million metric tons to some 4.23 million metric tons of carbon for the whole tournament, 82% of which comes from traveling fans, with around 3 million metric tons from flying alone.