We've discussed ecological footprints and other indicators of sustainability before, but here's a great radio report bringing those ideas home: a footprint assessment team studied the ecological impact of a Football Association cup game at Cardiff's Millennium stadium.
The event generated an ecological impact of 3,051 hectares in a single day. An area equal to about one fifth of the area of Cardiff would be needed every year to produce the ecological goods and services to hold that day's game on a sustainable basis, mostly because of the transportation to and from the game, the high amount of processed food consumed, and the vast piles of waste produced. But simply shifting car traffic to buses would have reduced the overall impact by 24%.
There's also a nice segment with a gentleman from the London 2012 Olympics bid committee about their efforts to make those games the greenest ever -- including making the games an entirely-public-transport affair -- and a trip to Weee Man.