Race Emissions

Joe Saward reports on Williams' environmental impact report from 2009:

It is interesting to note that emissions generated directly from race cars remain a fraction of the company’s total CO2 output at 0.46% for 2009.

Environmentally Friendly

Here is an article about the environmental impact of F1:

A FOTA-commissioned report into the environmental impact of Formula found that each team produces an average of 215,558 tonnes of CO2 per year. Of that, 0.29% comes from the burning of fuel by F1 cars in testing and races. Over half an F1 teams’ emissions are produced in producing parts and electricity consumption accounts for another 30%.

Of course the largest impact a sport has on the environment is the fans travelling to and from the events. By this measure, the World Cup has a higher environmental impact than does Formula One.