One major challenge for stadiums in reducing their carbon footprint is:

One major challenge for stadiums in reducing their carbon footprint is that all the factors listed contribute to the overall environmental impact. Limited public transport access makes it difficult for attendees to use more sustainable travel options such as buses or trains. If people predominantly rely on personal vehicles, this leads to increased emissions.

Higher average attendance can further exacerbate the situation, as a larger number of people traveling to and from the venue typically means more vehicles on the road, increasing greenhouse gas emissions.

Geographic location plays a significant role as well; stadiums situated in areas far from urban centers may not benefit from existing public transport infrastructure, compelling attendees to resort to less eco-friendly means of transportation.

By acknowledging that each of these factors works in conjunction with the others, it becomes clear why addressing all of them is vital for effectively reducing a stadium's carbon footprint.