The Premier League's unrivalled global appeal has seen sold-out stadiums across the world this summer - with fans spread across various continents getting to see their heroes in real life.
But after calls for sport to use the pandemic as a chance to reset around its role in climate impact, the return to vast amounts of plane travel has raised questions on the cost to the environment.
Villa top of CO2 emissions
This table displays a BBC Sport estimate of each club's emissions in order of who has generated the most CO2 from air travel.
BBC Sport has not included emissions from domestic fixtures for the purposes of this comparison, given air travel - mile for mile - is the most damaging way to travel for the environment.