When the Queen and Prince Philip visited the USA and attended the Kentucky Derby in May 2007, it was the 1st time her, and her entourage’s, carbon footprint had been calculated.

The BBC calculated the party’s trip as follows..

Total air miles: 13,317 km/8,275 miles
Amount of CO2 emitted based on scheduled flights: 1. 5 tonnes
Estimated offset cost per person: £13.20 to £14.18 (depending on offset package)
These results were reached using The Carbon Neutral Company carbon calculator.

You can view a map of the royal trip at:
http://news.bbc.co.uk/1/hi/uk/6627481.stm#carbon