asked Her Majesty's Government:

What is their estimate of the likely total carbon emissions from all transport connected with the 2012 Olympics, including preparation, training in the United Kingdom and abroad, tourism and access to the sites by officials, visitors and athletes. [HL2592]

There are no national or international standards on assessing the carbon footprint of public events on the scale of the 2012 Games.

LOCOG and the ODA are developing a definition and measurement for the carbon footprint of the 2012 Games, and have commissioned a study to calculate an initial estimate, which will be published later this year.